What is a “translation unit” in C++

Question

I am reading at the time the \"Effective C++\" written by Meyers and came across the term \"translation unit\".

Could somebody please give me an explanation of:

Answer 1

C and C++ programs consist of one or more source files, each of which contains some of the text of the program. A source file, together with its include files (files that are included using the #include preprocessor directive) but not including sections of code removed by conditional-compilation directives such as #if, is called a "translation unit."