A network of networks
The internet is not a single machine or company. It is a collection of separate networks that agree to exchange data using shared rules. That idea of connecting networks together, rather than building one giant one, explains most of its history. Each decade below adds a layer on top of the last: first the links, then the rules, then the web, then the devices that put it all in a pocket.
The 1960s: research links
In the 1960s, computers were large, expensive and mostly isolated. Researchers in the United States, and separately in the United Kingdom, worked on a way to send data in small chunks called packets instead of holding a dedicated line open for each conversation. This approach, packet switching, let many users share the same lines efficiently.
The first big test was ARPANET, a US government-funded research network. Its first connection linked computers at two universities in late 1969, and a handful more joined over the following months. It was tiny by any modern measure, but it showed that separate machines could talk to each other over a shared network.
The 1970s: email and common rules
The 1970s brought the first widely used application: electronic mail. Ray Tomlinson is generally credited with sending the first networked email in 1971 and with choosing the @ symbol to separate a user name from a computer name. Email quickly became the main thing people used the network for.
The larger problem was that different networks used different technical rules. In the mid-1970s, Vint Cerf and Bob Kahn described a design that let networks interconnect, which grew into the TCP/IP family of protocols. Those protocols are still the foundation of how data moves today, including how an IP address identifies a device and how information is split up and reassembled.
The 1980s: standards and growth
On 1 January 1983, ARPANET switched over to TCP/IP, a date often treated as the birth of the internet as a connected whole. That same period saw the creation of the domain name system, which replaced hard-to-remember numbers with readable names. Without it, typing an address into a browser today would mean entering strings of digits.
Universities and research bodies built or joined their own networks, and the US National Science Foundation funded a faster backbone that connected academic computing centers. Use was still mostly limited to researchers, students and technical staff. Ordinary households rarely had a way to connect, apart from bulletin-board systems and online services reached by phone line and modem.
The 1990s: the web and commercial access
The early 1990s changed who the internet was for. Restrictions on commercial traffic were gradually relaxed, and private companies began selling dial-up access to the public. At about the same time, Tim Berners-Lee at CERN created the World Wide Web, a system of linked pages that could be read with a browser. The web is a service that runs on the internet, not the internet itself.
Graphical browsers such as Mosaic and then Netscape Navigator made the web approachable for people with no technical background. Search engines, early online shops and free email services followed. By the late 1990s, the phrase “going online” had become normal, and a wave of investment in internet companies built up.
The 2000s: broadband, social platforms and the crash
The investment boom ended in a sharp downturn around 2000 to 2002, when many internet companies failed. The underlying technology kept spreading, though. Broadband replaced dial-up in many homes, which made music, video and larger downloads practical. Home networks also changed: a wireless router and Wi-Fi meant a household could share one connection across several devices.
Sites built around user contributions grew quickly. Blogs, wikis, video sharing and social media let ordinary people publish rather than only read. Cloud services also emerged in the middle of the decade, allowing companies to rent computing power and storage over the network instead of owning every server.
The 2010s: mobile first
The launch of the iPhone in 2007, followed by Android phones, made the internet something people carried everywhere. Apps replaced many websites as the main way to reach services, and mobile data networks improved from 3G to 4G and then 5G. Streaming services changed how people watched and listened. Messaging apps with end-to-end encryption became mainstream, while concerns about data collection, tracking and misinformation moved into public debate.
Internet-connected objects also spread beyond computers and phones, a trend often grouped under the internet of things, covering everything from thermostats to watches.
The 2020s: infrastructure people rely on
By the 2020s, the internet is closer to a utility than a novelty. Work, school, banking and healthcare increasingly rely on it, and the shift to remote work and video calls sped up in 2020. Governments and companies still argue over regulation, privacy, security and who controls access, and some countries restrict or filter what their citizens can reach. Access also remains uneven: speed and affordability vary a great deal between regions.
What the history shows
A few patterns repeat. Open, shared standards let different networks join without a central owner. Each new layer, from email to the web to apps, was built on the one below it rather than replacing it. And uses people did not predict, such as social platforms and streaming, often ended up mattering more than the original purpose of sharing research computers.
The details of any given year can be debated, and dates vary slightly depending on what counts as the “first” of something. But the broad arc, from a few linked universities to a global network that billions of people use, is well documented.