How to play multiplayer minecraft without making a server?

You can join someone else's server. If you're interested, check out Bosscraft, it's a good server. http://bosscraft.enjin.com/home

Sure there's! Joining one!

There are open multiplayer servers around the webs. Look some up on the mincraft.net forums or planetminecraft.

If what you want is to play a local multiplayer, there's an option to host one at the push of a button. This method only allows people on the same router (same internet source) as you.