Mobile IP is a standard communication protocol that is designed to allow mobile device users to move from one network to another while maintaining a permanent IP address.
The home network of a mobile device is the network within which the device receives its identifying IP address (home address).
A foreign network is the network in which a mobile node is operating when away from its home network.
The home address of a mobile device is the IP address assigned to the device within its home network.
Thecare-of address of a mobile device is the network-native IP address of the device when operating in a foreign network.
A binding is the association of the home address with a care-of address.