A WAP's (Wireless Access Point) name is known as an SSID. Disabling SSID Broadcast allows you to hide the name of your access point. This does not truly secure your WAP, it should be used in addition to encryption and access control.
In IEEE 802.11 wireless local area networking standards, a service set is a group of wireless network devices that are operating with the same networking parameters.
Service sets are arranged hierarchically,: basic service sets (BSS) are units of devices operating with the same medium access characteristics (i.e. radio frequency, modulation scheme etc.), while extended service sets (ESS) are logical units of one or more basic service sets on the same logical network segment (i.e. IP subnet, …