WLAN stands for Wireless Local Area Network, and it is a way of providing a wireless high-speed connection between data devices or a data device and an access point. In the context of a phone, WLAN is used interchangeably with Wi-Fi, which is a type of WLAN that complies with the IEEE 802.11 standard. A phone with WLAN capability can connect to a wireless network using a local router, allowing the user to surf the web or check email. To turn on WLAN hotspot on an Android phone, one can go to "Settings" > "Tethering and Mobile hotspot" > "Mobile Hotspot" and turn on the mobile hotspot. It is important to note that using WLAN hotspot increases battery consumption and data usage.