ABS Light

When i was driving to school today i looked down and seen that my ABS light was on.
I have not done anything to my jeep lately so I dont really know what could have triggered it.
It this something i should be worried about?
I really dont want to go to a dealer, so is there a sensor or something else easy to replace that i should just get and see if it works?

I dont know if it matters but My jeep is a 96

check the fuses. who knows, maybe it could be an easy fix. dont forget to check the maxi fuse unter the hood.