When the network adapter receives a valid magic packet, the computer starts up.
It listens for a small piece of incoming data called the “magic packet”. This is how Wake-on-LAN works the target computer is shut down with enough power reserved only for the network adapter to function. Wake-on-LAN can turn on a computer on the same local area network or at another location via the internet. You can enable the Wake-on-LAN feature in the Power Management section of the motherboard’s BIOS. Most recent motherboards that have an integrated Ethernet controller support this feature. Wake-on-LAN (WOL) is an Ethernet networking standard that allows a shut down computer to be turned on remotely.