By Quick answer: How was the internet invented?
- 1960s idea — packet switching, developed by Paul Baran, Donald Davies and Leonard Kleinrock, breaks messages into small, independently routed packets.
- 1969, ARPANET — the first message, 'LO', went from UCLA to SRI on 29 October 1969 before the system crashed.
- 1983, the internet — on 1 January ARPANET switched to TCP/IP, the protocols designed by Vint Cerf and Bob Kahn.
- 1991, the web — Tim Berners-Lee's World Wide Web, running on top of the internet, opened it to non-specialists.
- 2025 — about 6 billion people online, three-quarters of the world, according to the ITU; India went online publicly in 1995.
Key takeaways
- No single person invented the internet; it was built in layers by many researchers over two decades.
- The internet and the web are different: the internet is the network; the web is one service that runs on it.
- Packet switching and open protocols made the network resilient and let anyone add new services on top.
- India's internet story turned on price: mobile data became cheap from 2016, bringing hundreds of millions online.
- About 2.2 billion people were still offline in 2025, mostly in low- and middle-income countries.
At about 10.30 at night on 29 October 1969, a student programmer named Charley Kline sat at a terminal in Leonard Kleinrock's lab at the University of California, Los Angeles, and tried to log in to a computer more than 500 kilometres away at the Stanford Research Institute. He typed an L. Over the phone, his counterpart at SRI confirmed it had arrived. He typed an O. Then the system crashed. The first message ever sent over the network that became the internet was "LO". This interactive timeline follows the internet from that moment to six billion people online, and explains the few ideas that made it work.
The history of the internet in one timeline
- 1961–1965
Packet switching
Leonard Kleinrock, Paul Baran and Donald Davies independently develop the idea of breaking data into small, separately routed packets1.
- 29 Oct 1969
ARPANET's first message
"LO" travels from UCLA to SRI before a crash; by December, four sites are connected2.
- 1971
Email
Ray Tomlinson sends the first network email and picks the @ sign to separate user and host.
- 1973–1974
TCP/IP designed
Vint Cerf and Bob Kahn publish a protocol for connecting different networks4.
- 1 Jan 1983
The internet is born
ARPANET switches to TCP/IP, the "flag day" that made it a network of networks1.
- 1983–1987
Domain names
The Domain Name System replaces numeric addresses with names like .com and .in6.
- 1989–1991
The World Wide Web
Tim Berners-Lee proposes and builds the web at CERN; it opens to the public in 19917.
- 1993
Mosaic
The first popular graphical browser puts images inside pages.
- 15 Aug 1995
India goes online
VSNL launches India's first public internet service.
- 1998
Google
Search makes the fast-growing web navigable.
- 2007
The iPhone
The mobile internet becomes mainstream.
- 2016
India's data boom
Mobile data prices fall steeply; hundreds of millions of Indians come online.
- 2025
6 billion online
About three-quarters of humanity uses the internet, according to the ITU8.
- First message: "LO"
- 29 Oct 1969
- ARPANET switches to TCP/IP
- 1 Jan 1983
- Public internet arrives in India
- 15 Aug 1995
- People online in 2025 (ITU)
- 6 billion
Packet switching: the idea that made it possible
Packet switching is the core idea of the internet: instead of holding open a dedicated line between two points, as telephone networks did, a message is broken into small packets, each labelled with its destination, sent separately through whatever route is free, and reassembled at the other end.
The idea emerged independently in the early 1960s. Leonard Kleinrock at MIT worked out the mathematics of queues of data; Paul Baran at the RAND Corporation designed a distributed network that could survive damage; and Donald Davies at Britain's National Physical Laboratory coined the word "packet"1. Packet switching used lines far more efficiently than dedicated circuits and kept working when parts of the network failed.
ARPANET: the first network (1969)
The Advanced Research Projects Agency (ARPA) of the US Department of Defense funded ARPANET so that its research centres could share expensive computers3. The contractor BBN built the network's routers, refrigerator-sized machines called Interface Message Processors (IMPs). The first was installed at UCLA in September 1969, the second at SRI; on 29 October came the "LO" message. By December 1969 four sites were connected: UCLA, SRI, UC Santa Barbara and the University of Utah2.
ARPANET grew quickly. Its own engineers drew "logical maps" of which machines were connected; by 1977 it spanned the United States with links to Hawaii and Europe.
TCP/IP: how separate networks became one internet (1974–1983)
By the early 1970s there were several packet networks, by radio, by satellite and by wire, that could not talk to each other. In 1974 Vint Cerf and Bob Kahn published "A Protocol for Packet Network Intercommunication", the design that became TCP/IP4. Its key decision was to keep the network simple and put intelligence at the edges: the network just moves packets (IP), and the computers at each end check that everything arrived and in order (TCP).
The Internet Protocol was standardised in 19815, and on 1 January 1983, ARPANET switched over completely: the moment historians usually treat as the birth of the internet1. The Domain Name System followed, replacing hard-to-remember numeric addresses with names6. Because TCP/IP was open and simple, anyone could build new services on top without permission: email, file transfer, and, a few years later, the web.
The World Wide Web: the internet for everyone (1989–1995)
The internet existed for years before most people heard of it, because using it meant typing commands. In 1989, Tim Berners-Lee at CERN proposed a system of linked documents; by 1991 the World Wide Web was available to the public7. In 1993 the Mosaic browser added pictures to pages, and CERN put the web's software into the public domain, which let it spread without licence fees. Our post on old websites shows what those first sites looked like.
How India came online
India's internet began in research. ERNET, the Education and Research Network, linked Indian universities and institutes from the late 1980s. On 15 August 1995, the state-owned Videsh Sanchar Nigam Limited (VSNL) launched the country's first public internet service, through dial-up accounts that were expensive and slow.
Mass adoption came two decades later with smartphones and cheap mobile data. In 2016, a price war set off by Reliance Jio's launch drove mobile data prices sharply down, and hundreds of millions of people came online for the first time, often skipping the desktop computer entirely. By the mid-2020s India had close to a billion internet subscriptions, according to the telecom regulator TRAI9, and the world's highest volume of real-time digital payments through UPI.
Who is still offline?
About 2.2 billion people were offline in 2025, according to the ITU; 96% of them live in low- and middle-income countries, and the gap between cities and rural areas remains large: about 85% of urban residents use the internet, compared with 58% in rural areas8.
What the internet's history teaches product builders
Open standards win
TCP/IP and the web spread because anyone could use them without permission. Platforms that are easy to build on grow fastest.
Keep the core simple
The internet's "dumb network, smart edges" design let new uses appear without changing the network. Simple cores make products adaptable.
Usability unlocks adoption
The internet had millions of potential users for years; the graphical web and then the smartphone made it usable for billions.
Price is a design decision
In India, cheap data did more for adoption than any feature. Cost is part of the user experience.
The last lesson is the one we see most often in practice: technology rarely fails for lack of capability; it fails when people find it too hard, too slow or too expensive to use. That is what a mobile app UX audit looks for.
Key terms, defined
Packet switching — sending data as small, independently routed packets rather than over a dedicated line.
ARPANET — the US research network, started in 1969, that was the internet's direct predecessor.
TCP/IP — the Transmission Control Protocol and Internet Protocol, the rules that let different networks exchange data.
DNS — the Domain Name System, which translates names like example.in into numeric addresses.
World Wide Web — the system of linked web pages, invented by Tim Berners-Lee, that runs on the internet.
How we researched this
The early history follows the Internet Society's "Brief History of the Internet", written by many of the people involved, the Computer History Museum and DARPA. Protocol dates come from Cerf and Kahn's 1974 paper and the original RFC standards. India's history and current figures come from public records and TRAI; global figures from the ITU's 2025 report. Photographs and ARPANET maps are from Wikimedia Commons, credited under each. Last reviewed October 2026.
Frequently asked questions
Who invented the internet?
No single person. Packet switching was developed in the 1960s by Paul Baran, Donald Davies and Leonard Kleinrock; ARPANET was built from 1969 under the US Defense Department's research agency; and Vint Cerf and Bob Kahn designed TCP/IP in 1973–74, the protocols that let different networks join into one internet. Cerf and Kahn are often called the fathers of the internet.
When was the internet invented?
Historians usually date the internet's birth to 1 January 1983, when ARPANET officially switched to the TCP/IP protocols, making it a network of networks. Its predecessor, ARPANET, sent its first message on 29 October 1969, and the World Wide Web that made it popular was opened to the public in 1991.
What was the first message sent on the internet?
On 29 October 1969, student programmer Charley Kline at UCLA, in Leonard Kleinrock's lab, tried to log in to a computer at the Stanford Research Institute. He typed 'L' and 'O', and the system crashed before he could type 'G', so the first message was 'LO'. The connection worked about an hour later.
What is the difference between the internet and the web?
The internet is the global network of networks that carries data using TCP/IP. The World Wide Web, invented by Tim Berners-Lee at CERN in 1989–91, is a system of linked pages and sites that runs on top of the internet, like email or video calls. People often use the words interchangeably, but the internet came first.
When did the internet start in India?
The research network ERNET connected Indian academic institutions from the late 1980s, and the state-owned Videsh Sanchar Nigam Limited (VSNL) launched the first public internet service on 15 August 1995. Mass adoption came much later, with cheap smartphones and the steep fall in mobile data prices from 2016.
How many people use the internet?
The International Telecommunication Union estimated in November 2025 that about 6 billion people, roughly three-quarters of the world's population, were using the internet in 2025, and that about 2.2 billion remained offline, 96% of them in low- and middle-income countries.
Sources
- Internet Society — Brief history of the internet (Leiner, Cerf, Kahn, Kleinrock et al.)
- Computer History Museum — Internet history
- DARPA — ARPANET
- Cerf & Kahn — A protocol for packet network intercommunication, IEEE Transactions on Communications (1974)
- RFC 791 — Internet Protocol (1981)
- RFC 1034 — Domain names: concepts and facilities (1987)
- W3C — A little history of the World Wide Web
- ITU — Facts and Figures 2025 (17 November 2025)
- Telecom Regulatory Authority of India (TRAI)
- Checked October 25, 2026. Figures that change — fees, salaries, prices — are reviewed every six months; if something is out of date, tell us.
Where to go from here
- Old websites then and now — what the web looked like at launch
- How Google Search works — how the web got organised
- Original dataIndian app statistics 2026: subscribers, broadband, UPI, installs, startups and what top apps look likeIndian app statistics for 2026 from official and public data: 1.35 billion telecom subscribers, 24 billion UPI payments a month and top-app benchmarks.
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- Career guidesNetworking skills employers want in 2027: the OSI and TCP/IP models, IP addressing and subnets, DNS and DHCP, routing and switching, Wi-Fi, VPNs and troubleshootingNetworking skills employers want in 2027: OSI and TCP/IP, IP addressing, subnets, DNS, DHCP, routing, switching, Wi-Fi, VPNs, troubleshooting and pay.
- Career guideseLearning design and development for 2027: authoring tools, interactive scenarios, microlearning, video and audio, accessibility, mobile-first design, SCORM and xAPI tracking, and AI-assisted course buildingeLearning design for 2027: authoring tools, interactive scenarios, microlearning, video, accessibility, mobile-first design, SCORM and xAPI, and AI tools.
- Tech stackHow to choose a database for your app: a six-question decision guide with recommendationsHow to choose a database for your app: six questions on data shape, queries, consistency, scale, team and compliance — with clear picks for common app types.
- Original dataThe most downloaded apps in the world in 2025, and the countries that download the mostChatGPT was the world's most downloaded app in 2025 with 845 million installs. See the top 10, India's lead in downloads and our per-person country analysis.
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