Gateway n. : A passage through a fence or wall; a gate; also, a frame, arch, etc., in which a gate in hung, or a structure at an entrance or gate designed for ornament or defense.

Example:
Why should I get a payment Gateway service?

Taxonomy
Desktops, all-in-ones, Notebooks, laptops, monitors, netbooks, quality notebooks, Official Site, deals, retailers, flat panel, LCD, Gateway support, Gateway computers, Gateway products, United States, industry-leading, technology.

Defination from the web:
Allows customers to configure and buy desktop or notebook computers online.