Learn in the textbookWireless LAN and Wi-Fi
DefinitionAn ESSID is the network name of a wireless LAN, and a device picks this name to decide which network to join.
ExplanationAn ESSID is also called an SSID, and the administrator can choose any name up to 32 characters. Several access points can be given the same ESSID so that they are treated as one network. Turning off ESSID broadcasting so the name does not show up in nearby devices' lists is called the stealth feature (ステルス機能, also ステルス化).
AnalogyIt is like the signboards on a row of shops. Even among invisible radio waves, you can read the name on the sign and choose which shop to walk into.
Memory hookESSID stands for Extended Service Set Identifier. The final word, Identifier, shows that it is a name for telling networks apart.