can someone explain mp3 vs .wav files

hello reddit!!

I’m a beginner dj just starting out and i’m really trying to understand music files and obtaining high quality music.

I’m currently practicing with shitty compressed mp3s that sound TERRIBLE.

but i’m trying to transition into higher quality music. people have been recommending .wav files but i don’t understand where to get those. or what’s the difference between .wav and a better quality mp3

can someone explain this to me like im a dumbass? because i don’t understand.