.c File — C Source Code

C is one of the most influential programming languages in computing history, developed by Dennis Ritchie at Bell Labs between 1969 and 1973. C files contain source code in this compiled, statically-typed, procedural language that provides low-level access to memory through pointers while maintaining enough abstraction for structured programming. C is the language of operating systems — Linux, Windows, macOS, and virtually all Unix variants are written primarily in C. The language is also used for embedded systems, device drivers, databases (PostgreSQL, SQLite, Redis), interpreters (CPython, Ruby MRI), compilers, and performance-critical applications. C provides direct control over hardware, manual memory management, and minimal runtime overhead, making it essential wherever performance and resource efficiency are paramount. The C standard has evolved through C89/C90, C99, C11, C17, and C23, each adding features while maintaining backward compatibility. C's influence is enormous — it directly inspired C++, Objective-C, C#, Java, JavaScript, Go, Rust, and many other languages. Understanding C provides foundational knowledge of how computers actually work at the systems level.