A Service Set Identifier (SSID) is the name that identifies a wireless network. All devices on the network must know the SSID of the wireless network, or they will not be able to communicate with each other. Usually, the wireless network broadcasts the SSID to allow wireless devices in the area to connect to it. Sometimes, the SSID is not broadcast for security reasons.
If the SSID of your wireless network is not broadcast, then it cannot be detected automatically and will not show up in the list of available wireless networks. You must enter the network information manually in this situation.
An SSID can contain up to 32 alphanumeric characters. Alphanumeric characters are a combination of alphabetic (letters A to Z) and numeric (numbers 0 to 9) characters.