In WLAN formation I will show you basic definition and explanations of abbreviations you have heard hundred of times. WLAN networks consist of:
1) Distribution system - combination of bridging engine and backbone network.
2) Access Point - performs wireless to wired bridging function.
3) Wireless Medium - for exchanging frames between stations and backbone.
4) Station - PCs, laptops and other devices with wireless network card.
The basic block of 802.11 networks is BSS - Basic Service Set. This is group of stations that communicate only between them.