Can you explain what a programming language that requires pre-compilation before execution is?

A language with ahead-of-time compilation is a language whose source code is first transformed into machine code or intermediate code using a compiler before the program is executed. This approach allows errors to be detected at compile time and improves runtime performance since the code is already prepared for the processor.

Example: In C#, the source code is compiled into intermediate language (IL), which is then executed by the CLR environment. Unlike interpreted languages, where code is executed line-by-line without prior compilation.