An SSID, or Service Set Identifier, is the broadcast network name of a Wi-Fi access point. Nearby devices use it to list available networks, and users often rely on it when choosing where to connect.
SSID matters in cyber security because it is easy to imitate. Attackers can create a rogue access point with a spoofed SSID that looks like a trusted network, a classic evil twin attack. If a device auto-connects or a user picks the fake name, the attacker can present a captive portal, capture credentials, or intercept traffic. Defenders monitor for duplicate or suspicious SSIDs, compare BSSID and certificate details, and use rogue AP detection to spot impersonation. In practice, the SSID is a small label, but it is often the first clue that a wireless network is genuine or a trap.