Wake-on-LAN (WoL) is a network protocol that allows a computer to be powered on remotely over a network. It works by sending a “magic packet” to the target computer’s network interface card (NIC), which triggers the computer to power on.

The Wake-on-LAN protocol is supported by many modern network adapters and motherboards, and can be enabled in the computer’s BIOS settings. Once enabled, the computer’s NIC will remain active even when the computer is turned off or in a low-power state, allowing it to receive the magic packet and power on.

Wake-on-LAN is commonly used by IT administrators to remotely power on computers for maintenance and updates, as well as by home users to wake up their computers from a remote location for file sharing or media streaming purposes.

There are several tools and software applications available for sending Wake-on-LAN packets over a network, including command-line utilities, mobile apps, and desktop applications. These tools typically require the MAC address of the target computer’s NIC and the IP address or hostname of the network router or switch that the computer is connected to.

Overall, Wake-on-LAN is a useful and convenient protocol for remotely powering on computers over a network, and can save time and effort for IT administrators and home users alike.