What is psp homebrew and psp emulators?

[irahat]

I am new to PSP world and I heard these 2 terms, I really don't know the meaning of these 2 terms so please tell me what do they mean and what do they do? Thanks.

[zigzag]

well psp home brew are programs made by other people (not sony) that you can use on your psp if it is hacked. an example is some guy made a program that turns ur psp into an alarm clock.