Liquid Rocket Lab - Solid vs Liquid Fuels

So what’s the difference between a solid fuel rocket and a liquid fuel rocket? And why is Cal Poly Pomona building a liquid-fueled rocket for Bronco 1?
LIQUID ROCKET LAB
Cal Poly Pomona students and faculty are building have established a new Liquid Rocket Lab with the long-term goal of being the first university in space. The team's first project is Bronco 1, a liquid-fueled rocket that uses liquid methane and liquid oxygen.
Read more in Spring 2018 issue of Bronco Digital Magazine. broncomag.cpp.edu/
Cal Poly Pomona. www.cpp.edu