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Ritchie, along with Ken Thompson and others at Bell Laboratories, began working on Unix in 1967 as a replacement operating system for the Digital Equipment Corporation’s PDP-7 mini computer.
Within this same time, Ken Thompson also developed the B computer programming language with Ritchie’s contribution, and in 1971, Ritchie began developing C as an extension of B.
Today, C is one of the most commonly used languages for embedded and operating system development, such as macOS and Android. There have been several languages developed as extensions of C including C#, C++, and Java.