What is an .inc and why use it?

Question

I often see examples in PHP that include.inc files. What is the meaning of .inc? What it is used for? What are the disadvantages and advantages of using it?

Answer 1

This is a convention that programmer usually use to identify different file names for include files. So that if the other developers is working on their code, he can easily identify why this file is there and what is purpose of this file by just seeing the name of the file.