hi, can someone please explain what integrals are? and what exactly is antiderivative also?

I need the basics and if you can please explain to me in a simple way, it would be nice

I have been searching for the meanings and basics of these 2 terms, and all I get are new terms that i dont understand.

I am currently taking Calculus in HS, and I am not doing so well.

So if someone would be so kind and help me, i would appreciate it greatly.

Thank you in advance!