With WLAN it is possible to exchange data within a network, but the main use is to connect to the Internet. Before a connection to a network, usually a router, can be established, WLAN must be switched on.

Note: On Samsung devices, WLAN can be switched on/off using the settings and the quick settings in the status bar.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Enable or disable  Wi-Fi
  1. Open the Settings
  2. Tap on Connections
  3. Enable or disable Wi-Fi

Samsung Instructions