Wifi security question, what is WEP?

[Richie]

So I want to change my wifi so that I can use it with my pokemon games, it says on the Nintendo customer service site that I have to change my wifi WEP key to WEP-shared instead of what it is, it says that I will need to religion in with the new information, what will changing the WEP do to the wifi? Will I need a new password of something, please tell me, thanks!