Question about auto-tune/audio effects

Hello,

I've been looking through a few of the following videos:

Barack Obama Singing Sorry by Justin Bieber - YouTube

Barack Obama Singing Shape of You by Ed Sheeran (VERSION AUTO TUNE) NOW ON iTUNES - YouTube

Camila Cabello - Havana ( cover by Donald Trump ) - YouTube

I'm curious, which audio effects are being used to auto-tune the original voices to create these effects? Is there possibly an Audition plugin being used here? I'm looking to possibly create these videos myself.

Regards