What is meant by the term “hook” in programming?

Question

I recently heard the term \"hook\" while talking to some people about a program I was writing. I\'m unsure exactly what this term implies although I inferred from the conve

Answer 1

Simple said:

A hook is a means of executing custom code (function) either before, after, or instead of existing code. For example, a function may be written to "hook" into the login process in order to execute a Captcha function before continuing on to the normal login process.