Internet History

In simple terms

The internet didn’t appear all at once. It started as ARPANET, a research network funded by the US Department of Defense in 1969, grew through universities in the 1970s and 1980s, opened to commercial use in the 1990s, and exploded into a global mass medium with the World Wide Web in the mid-1990s.

More detail

A compressed timeline:

• 1969 — ARPANET sends its first packet between UCLA and SRI.
• 1971 — Ray Tomlinson sends the first networked email; introduces the @ sign.
• 1973–1983 — TCP/IP designed and standardised. Vint Cerf and Bob Kahn key designers.
• 1983 — ARPANET switches to TCP/IP.
• 1984 — DNS is introduced. Pre-DNS, name-to-IP mapping was a single text file synced by hand.
• 1989 — Tim Berners-Lee proposes the World Wide Web at CERN.
• 1991 — The first website goes live.
• 1993 — NCSA Mosaic browser brings the web to ordinary users.
• 1995 — Commercial restrictions on the internet are lifted. Amazon, eBay, etc. launch.
• 2004 — Web 2.0 era: blogging, RSS, AJAX, Facebook.
• 2007 — iPhone — internet goes mobile-first.
• 2010s — Cloud, social media, video-on-demand mainstream; mobile passes desktop.
• 2020s — Generative AI, increased platform consolidation, fragmentation of the open web.

Architectural ideas that shaped it:

• Packet switching (vs. circuit switching) — the design that made it survivable and scalable.
• End-to-end principle — keep the network simple, push intelligence to the edges.
• Open standards — RFCs are free, implementable by anyone. The standards process at the IETF is itself a remarkable institution.
• Layered protocols — IP at the bottom, transport (TCP/UDP) above, applications (HTTP, SMTP) on top.

Why it matters

The internet went from a curiosity to a load-bearing piece of human civilisation in a single working career. The technical choices made early — open, distributed, end-to-end — were not inevitable, and they shape everything from network neutrality debates to the structure of the modern tech industry.

Real-world examples

• The IETF’s “rough consensus and running code” still governs many of the protocols that make this page reach you.

• A .com domain in 1995 cost ~$100/year and was a novelty; today it’s an essential commodity.

• Internet shutdowns by national governments illustrate how much of public life now runs on it.

• The internet briefly had no commercial use at all: the NSFNET Acceptable Use Policy banned commerce until 1995. The web’s commercial explosion happened because that policy lifted.

Common misconceptions

• “The internet is the web.” The web is one application (HTTP + browsers) on top of the internet. Email, SSH, BitTorrent, DNS, video calls all use the internet without using the web.
• “The US invented and runs the internet.” Origins were American; the design and operation are profoundly international.

Learn next

The directory service that made names possible: DNS. The web protocol on top: HTTP. The broader context: history of computing.