WLAN means Wireless LAN
Wireless LAN is a wireless local Area network that usually also provides access to the Internet. Multiple devices are needed: With a wireless adapter, you connect to an access point (which is a machine that emits signals). In addition, many commerciëe access points also have a router/switch or modem, which is often referred to as a wireless modem. Often the access point is connected to a wired network. Most people know WLAN from another name: WI-Fi.