Seeing "Hidden Network" on my wi fi list.

[popeyespappy]

Not broadcasting a SSID is an added level of security. Someone still has to know the name of the wireless network to connect, but it isn't being broadcast to the whole world to see. That makes it harder for someone to access the network. they have to know the SSID and the password.

It's worthless security:

Debunking Myths: Is Hiding Your Wireless SSID Really More Secure?

Not completely worthless. No, it isn't going to keep someone that knows what they doing from identifying your network SSID, but it can help keep random neighbors from "borrowing" your network connection.