Users attract users
A communication network becomes more useful as more people are reachable through it.
Science & Discovery
It took radio 38 years to reach 50 million users. The internet took 4 years. The internet spread by a mechanism older media did not have: open protocols plus network effects.
Quick answer
The internet spread quickly because its core standards were open, non-proprietary, and permissionless. Anyone could connect, build, and make the network more valuable for everyone else. A network designed for resilience became a platform no single company could fully own.

The hook
TCP/IP protocols were open standards.
The hidden mechanism
Packet switching made the network distributed and resilient.
The twist
The web made the internet usable for non-specialists.
Common mistake
The internet was not inevitable; proprietary rivals existed.
Science & Discovery
The internet spread quickly because its builders gave away the rules of connection.
The Common Misunderstanding
The real explanation is more interesting because it shows the system, pressure, and tradeoffs behind the event.
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Inventions & Technology
Another curiosity-driven explanation about ideas, science, or technology changing the world.

Science & Discovery
Another curiosity-driven explanation about ideas, science, or technology changing the world.

Inventions & Technology
Another curiosity-driven explanation about ideas, science, or technology changing the world.