C++
C++ is a statically-typed, compiled, intermediate-level language and is actually the most used programming language for game programming. It can be considered, easily put, a version of the popular C language with object-oriented features, which include the ability to create classes.
C++ is implemented on several hardware configurations and operating systems, and being a very efficient way to compile native code, it is used to develop system software, applications, device drivers, data servers, and naturally, video games.
Renowned companies such as Microsoft and Intel offer C++ software compilers (for example, the popular Microsoft's Visual Studio) to create and manage programs written with C++. You can check the latest version (at the time of writing) Visual Studio 2012 Express at http://www.microsoft.com/visualstudio/eng/products/visual-studio-express-products.
Being such a versatile programming language, C++ has influenced several other languages that are used for game programming, such...