Question

Debug is a term denoting what?

Answer 1

Debug is a term that denotes the removal of bugs from a program.

Bugs are just errors made by the programmer which can cause the program to misbehave or not function as intended.

To debug a piece of code means to find and fix possible issues (or bugs) in that piece of code by examining what went wrong (using debugging tools or manually by printing out variables) and then correcting the error by inserting, removing or modifying characters in the code of the program.

I hope that helps.