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.
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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.