Extensible Authentication Protocol (EAP) is a secure way for computers and other devices to identify themselves to a network. It uses a secure authentication process, so that only authorized users can access the network. EAP is an important way to keep networks and computers secure from unauthorized access and tampering. EAP works by having the device trying to access the network send messages with information, like a username and password, to the network. The network then checks if the information is correct. If it is correct, the network will allow the device access. If not, then it will not allow access and the user will need to try again.