Wikipedia
In IEEE 80211 wireless local area networking standards (including Wi-Fi), a service set (also known as extended service set or ESS) is a group of wireless network devices which are identified by the same SSID (service set identifier) SSIDs serve as "network names" and are typically natural language labels A service set forms a logical network - that is operating with the same level 2 networking parameters- they are on the same logical network segment (eg, IP subnet or VLAN) Basic service sets (BSS) are a subgroup of devices within a service set which are additionally also operating with the same physical layer medium access characteristics (i
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