Wireless networks include a wireless access point, which has a radio for sending and receiving signals. Many home units will have the router and wireless access point and switch all integrated into a single device.
In a corporate network, a wireless LAN controller would manage multiple access points, with each of those access points being physically wired into a Layer 2 switch.
The antennas can be omnidirectional or unidirectional or a combination of both for the access points.
The 2.4-GHz range and the 5-GHz range have been allocated as available space and are used commonly by LAN WiFi.
Common WiFi standards include 802.11a, 802.11b, 802.11g, 802.11n, and 802.11ac.
The basic service set or extended service set is the method used to identify wireless LANs.
Signal interference or signal degradation would need to be planned for, and a site survey before and after deploying wireless is typically performed.
Wireless security using WPA2/802.11i should be done to properly authenticate and secure the communications over the wireless network.