WIFI Technology Overview

WiFi is an international Wireless local area network (WLAN) standard, full name Wireless Fidelity, also known as IEEE802.11b standard. WiFi was originally based on IEEE802.11 protocol, published in 1997, defined WLAN MAC layer and physical layer standards. Following the 802.11 protocol, many versions have been introduced, the most typical are IEEE802.11a, IEEE802.11b, IEEE802.11g, and IEEE802.11n.
WiFi system composition:

WiFi is the use of wireless communication technology to connect computer devices
The essential characteristics of WiFi LAN: no longer use communication cables to connect computers to the network,
Network topology:
WiFi can be networked through different network topologies, and its discovery and access network also has its own requirements and steps. WiFi wireless networks include two types of topology: Infrastructure and Ad-hoc.
Two important basic concepts:
Station (STA) : The most basic component of the network, every terminal connected to the wireless network (such as laptops, PDAs and other user devices that can be networked), can be called a site. Wireless Access Point (AP) : The creator of a wireless network and the central node of the network. The average wireless router used in a home or office has one AP.
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