What's a Sippy?

Seriously, have you ever seen a 10 month old drink from a cup by himself without spilling?  Me either, until now!  Tyke prefers cups to sippys, and so do we!  He makes a mess with his sippy cup but with a regular little cup of water he doesn't.  He knows just what to do and gulps his drink down.  He's so cute to watch!  He sticks his face into his cup and gulp, gulp, gulps, comes up for air and smiles and goes right back to gulping it down.  He's amazing!