alright, there's two things people may mean by evolution.
1. they may mean, living organisms evolving over time. we do actually see this happen.
2. they may mean, the theory that all that exists has randomly come into being. many people SAY that this THEORY is proven fact. if they would RESEARCH it, however, they would find this isn't actually proven. this theory might be true. it might not be.
1. "my dog is evolving... it's becoming a cat!"
2. "omg! you don't believe in evolution? you're a loser. what? uh... no, i haven't really researched it. i just believed what they fed me in my biology class."