A gateway is a network point that acts as an entry way to another network.
A gateway is a network point that acts as an entryway to another network. It's a link between two devices allowing them to share information by translating between protocols on a computer or between dissimilar computers. It can be a computer connected to both networks and ferrying information between them, or a dedicated router device built for this purpose. Examples are email gateway, Voice/Media gateways, and NAS to name a few.
