Valve is the company that created Steam.

Valve was founded by Mike Harrington and Gabe Newell in 1996.

Valve are best known for award winning First Person Shooters.

Valves franchises include Half Life, Counterstrike, Left 4 Dead and Team Fortress.

Steam was released in 2004 with a Beta of Counterstrike Source with the title Half Life 2 becoming the first retail game to use steam

Valves Video games are considered some of the best in the world

http://www.valvesoftware.com/

VALVE CATALOG

Valve catalog includes any franchise that is developed by Valve.

These include:
Half life
Counter-Strike
Team Fortress
Garry's Mod
Portal
Left 4 Dead

http://www.valvesoftware.com/games/

Steam

I am going to do my presentation on the Computer Program Steam

Steam is a program released in 2004 by the software developer VALVE

Steam is a PC-based program that enhances the experience that one has when playing computer games.

Steam performs many functions

Multiplayer Lobby
Server Platform
Online Store
Social Networking

Steam is downloaded from the Valve Website for Free! However to experience Steam at its intended level will require the purchasing of games

A like to a HTML version of steam can be found

http://store.steampowered.com/