What is ESS (Extended Service Set)?

An extended service set (ESS) is at least one interconnected basic service set (BSSs) and their connected LANs. Each BSS comprises a solitary access point (AP) along with all wireless client devices making an enterprise 802.11 wireless LAN. It gives long range wireless communication. ESS upholds versatility; for example a client can move from one place or area to another and can in any case be associated with no interference.