What does Application gateway mean?

Application gateway meaning in Computer Science Dictionary

Alternatively known as a software firewall or application proxy, a credit card applicatoin portal is an application that's operate on a firewall or proxy that negotiates a link between a system application running on a computer behind the firewall and another computer system. This connection provides included safety to computer systems behind the firewall, by only showing the ip for the firewall or proxy, but in the price of decreasing the entire speed, you send out and obtain information.