What is difference among SSID, BSSID and ESSID?

SSID
Short for Service Set Identifier, a 32-character unique identifier attached tothe header of packets sent over a WLAN that acts as a password when a mobiledevice tries to connect to the BSS. The SSID differentiates one WLAN fromanother, so all access points and all devices attempting to connect to aspecific WLAN must use the same SSID. A device will not be permitted to jointhe BSS unless it can provide the unique SSID. Because an SSID can be sniffedin plain text from a packet it does not supply any security to the network.

ESSID
The Extended Service Set ID (ESSID) is the name of the network you want toaccess. It is used to identify different wireless networks.

BSSID
The BSSID is a 48bit identity used to identify a particular BSS (Basic Service Set) within an area. In Infrastructure BSS networks, the BSSID is the MAC (Medium Access Control) address of the AP (Access Point) and in Independent BSS or ad hoc networks, the BSSID is generated randomly.

If you need to replace the SSID (Service Set Identifier) of your wireless network, you can do so by accessing your router's settings. I often play games and some games have such requirements that are not as simple as when I play