hooks and callbacks

Ive read definitions of both of these and I just dont have a clear idea of what they are. What I think they are is:

hook: replacing an interface function with your own function to change the functionality of an interface

callback: putting a function call inside a function call so when you call a function it calls your function that you gave it

is this right?

depends on context, eg in some VCS hooks are scripts that are ran pre/post commit.

callback is usually when you're dealing with async programming: you request for some operation that takes time to take place and supply a function that should eventually be called with the result.