GW refers to Gateway, which is short for Gateway. It is also known as an interconnection device or protocol converter. Gateway is used for network interconnection above the network layer and is the most complex network interconnection device. It is only used for interconnecting two networks with different higher layer protocols.

Gateway can be used for both wide area network interconnection and local area network interconnection. It is a computer system or device that performs the task of conversion. It serves as a translator between two systems that use different communication protocols, data formats, languages, or even completely different architectures.

The core gateway protocol is used in the Internet, where there is a backbone network to which all autonomous systems are connected. Core gateways communicate with each other by sending GGP messages and waiting for responses, and then update if they receive responses containing specific information.