Platform · 1971–now · Foundations
Unix / POSIX
Process model, pipes, and files-as-interfaces. Linux and macOS still speak this dialect every day.
Why Unix / POSIX stuck
Small composable tools beat monolithic suites because they scale with human attention, not vendor roadmaps. POSIX became the contract every serious OS had to honor. The ideas were right; the branding just got renamed Linux and macOS.
Compare with
Related
Language · 1972–now
C
The substrate language. Kernels, compilers, embedded — still the lingua franca when you need the metal.
Platform · 1991–now
Linux
The production OS. Cloud VMs, containers, phones, routers — the penguin ate the datacenter.
Architecture · 1983–now
TCP/IP
The network stack that won. Every "revolutionary" protocol still rides these packets.