What does "code base" mean?

Native speaker’s answer
Rebecca
"Code base," also spelled as one word "codebase," is a noun that means the complete source code for a program. A "source code" is a set of instructions and statements written by a programmer using a computer language program. So it's the text and code that directs the way a program runs. Ex: The original codebase was later rewritten by the programmers. Ex: The software has an open-source code base.