What is the difference between an inelastic and an elastic collision?

What does kinetic energy have to do with all of this?
Give an explanation that explains the role of momentum, kinetic energy, and such in collisions.

I think elastic collisions is when the things bounce of each other and inelastic is when they actually sort of stay together after the impact and travel at the same velocity, right?

Can I please get some help with this? I'm a little iffy on my explanation and can't figure out the other ones...

In elastic collisions, both the total momentum and kinetic energy remain unchanged. In inelastic collsions, only the mometum remains the same. Inelastic collsions can "bounce"; the colliding objects do not have to stick to each other. All "sticky" collisions are inelastic.