Algebraic Topology

I'm working on a project that is connected with poincare sphere. As I was researching I stumbled upon the term poincare homology sphere. I don't have a background in abstract algebra or topology so it's completely new for me. Are they(the spheres) the same thing? I know topology has some weird things to say on shapes that seem different to non mathematicians so I don't know if the two sphere are the same or not. If they are related then I'll make myself familiar with the background.