Comparative:
This house is bigger than the other.

I am happier than ever now.

It would be better if you show up for the party on Sunday.

I am stronger than you.

This one is cheaper than the last one.

Superlative:

He is the most attractive guy in the school.

This is the funniest joke I know.

You're the kindest person I know.

This is the easiest game in the whole world.

Sarah is the youngest person among us.