What are all matter particles made of?

Answer:
It might be quarks (plus leptons and a few other things) or it could be strings (à la string theory). But we don't know for sure, and that's why we're still looking for answers. What is the ultimate nature of matter? Links are provided.
First answer by Quirkyquantummechanic. Last edit by Quirkyquantummechanic. Contributor trust: 3698 [recommend contributor recommended]. Question popularity: 2 [recommend question].