Steam



Steam is a digital video game storefront and a launcher for Microsoft Windows, and, operated by Valve Corporation.

Overview
Steam is an Internet-based digital distribution, digital rights management (DRM), multiplayer, and social networking platform developed by Valve Corporation. Steam provides the user with installation and automatic updating of games on multiple computers, and community features such as friends lists and groups, cloud saving, and in-game voice and chat functionality.

Grand Theft Auto Titles on Steam
Currently, 9 Grand Theft Auto titles are listed on Steam, and only 2 can be purchased (See Retired Games for titles that are still listed on Steam, but no longer purchasable):