It's a flavored drink with tapioca balls that looks like pearls -- I think it originated in either Hong Kong or Taiwan.

There are different flavors -- strawberry, watermelon, taro, lychee, etc. and it's usually fruity and milky in taste. They give you big straws so you can suck up the tapioca.

We have tons of bubble tea (or boba, as it's sometimes called) kiosks here. I know some cities have specialty bubble tea shops here and there also. Some grocery stores carry the bubble tea kits on their shelves, although it's not the same.

They're usually cheap, too. I've only paid between $2-$4 for mine.