A service set identifier is the name used to identify a Wi-Fi network to users and compatible devices. Several access points can advertise the same SSID, and a router may use one name across supported frequency bands. The visible name alone therefore does not reveal the exact radio connection, access point or internet route being used.
A practical example
A television may reconnect automatically to a saved network name after a router is replaced. If the new network uses different security or connection arrangements, confirming the actual saved connection can be more useful than relying only on the familiar name shown.
A common misunderstanding
Two networks can share a similar or identical name without being the same trusted network. Verify the intended access point and security details rather than joining an unfamiliar name casually.
Related terms
Stable technical definition. Editorial approach