An SSID (service set identifier) is the primary name associated with an 802.11 wireless local area network (WLAN), including home networks and public hotspots. Client devices use this name to identify and connect to wireless networks. Simply put, it’s the name of your Wi-Fi network.
Wireless LAN: WAP, BSS, BSSID, SSID, ESS and ESSID
The SSID is a case-sensitive string of text that is up to 32 characters long and consists of letters and numbers. Within those lines, the SSID can say anything.
When you connect to a wireless network, you will see your network and others within range that have a different name. Any names you see are the SSIDs for those networks.
Router manufacturers set a default SSID for the Wi-Fi unit, such as Linksys, xfinitywifi, NETGEAR, dlink, or default. However, because the SSID can be changed, not all wireless networks have a default name.