i know pickups are what "Pick up" the sound on a electric guitar but....how do they make a diffrence to what sound it makes?

Hughes & Kettner Switchblade 100
Orange PPC412AD
Seagull S6 Cedar Slim
Manuel Rodríguez C1M

Guitarist of Ravenage
Drummer of Windrider
Solo Project is Aloeswood
different pickups give you different tone
humbuckers give you a deeper, richer tone. better for really heavy music. single coils, for example give you a lighter tone better for emo riffs and gentler stuff
hope it helps