With PC games, sometimes its hard to tell whether or not you want to keep a game that you just downloaded. Maybe your PC just cant run it well, maybe you brought a game that had a convincing description, or maybe you just bought a bunch of games that had a ridiculously low price but in retrospect you were never going to play them anyways. Regardless of the reason, you can now request a refund for almost any purchase on Steam, as long as you request a refund within 2 weeks of purchase, and as long as you played the game for less than 2 hours.
Things that you can request a refund for extend beyond just full games though. DLC, in game purchases, pre-ordered games, and bundles are all eligible for a refund, which can be requested at help.steampowered.com. If your refund is approved, then your Steam Wallet will receive the refund, or if your payment method allows it, your refund will go directly back to your preferred payment method within a week. However, not all things are eligible for refund, as movies, gifts, and codes purchased from a third party are ineligible for a refund. Furthermore, if you have been banned by the Valve Anti-Cheat system, you lose the right to refund the game that you have been banned on, or if it is determined that you are abusing your right to a refund.
This new Steam policy is not unlike the EA Origin Great Game Guarantee Policy, where you are eligible for a refund on a title for any reason as long as it is within a certain time period. As of now, the only major digital marketplaces where refunds are not offered for all situations (notably in cases where the content is not up to your expectations) are the PlayStation Store and the Xbox Live Marketplace, and it is doubtful whether or not they will eventually catch up with Steam and Origin’s refund policies.