This might be a dumb question

[Young Link Addict 67]

This might be a really dumb question but what are friend codes anyway? I'm sorry if this is dumb I'm just really clueless.

[Cockwaffle 0]

YOU DUMB MONKEY.

..

>>

<<

It's a small, I guess signature, of games (DS) and the console (Wii) that when entered into someone else's game/console, they are added as a "Friend" and there's a "Play with Friends" mode that allows you to play only with the people you have added to your game/console.