A .cpp file is a source code file written in the C++ programming language, which is a powerful, high-level, general-purpose language that supports procedural, object-oriented, and generic programming features. These files contain the actual logic, algorithms, and instructions of a program, including variable declarations, function definitions, and complex control structures. C++ is widely utilized for system and software development, game engines, high-performance applications, and embedded systems due to its efficiency and low-level memory manipulation capabilities. To transform into an executable program, a .cpp file must be processed by a compiler, such as GCC, Clang, or MSVC, which translates the human-readable code into machine-specific binary code. Often, .cpp files are part of a larger software project and work in conjunction with header files, typically ending in .h or .hpp, which contain declarations for the functions and classes defined in the source file. Because they are stored in a plain text format, they can be opened and edited in any basic text editor, though professional developers typically use Integrated Development Environments (IDEs) for advanced features like debugging, syntax highlighting, and automated building.