What is APPLICATION-LEVEL GATEWAY? What does APPLICATION-LEVEL GATEWAY mean?

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What is APPLICATION-LEVEL GATEWAY? What does APPLICATION-LEVEL GATEWAY mean? APPLICATION-LEVEL GATEWAY meaning - APPLICATION-LEVEL GATEWAY definition - APPLICATION-LEVEL GATEWAY explanation.

Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.

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In the context of computer networking, an application-level gateway (also known as ALG or application layer gateway) consists of a security component that augments a firewall or NAT employed in a computer network. It allows customized NAT traversal filters to be plugged into the gateway to support address and port translation for certain application layer "control/data" protocols such as FTP, BitTorrent, SIP, RTSP, file transfer in IM applications, etc. In order for these protocols to work through NAT or a firewall, either the application has to know about an address/port number combination t...