What does hook mean in programming language?

Answer 1

A hook is a method of interposing a piece of code in front of another piece of code, so that the first piece of code executes before the second piece of code, giving the first piece of code an opportunity to monitor and/or filter the behavior of the second piece of code. An example might be a mouse hook, allowing the hook code to monitor the mouse while at the same time preserving the functionality of the original mouse event processing routine.