The Steam Community Market is an extension of the Steam Community that lets you buy and sell in-game items, Steam Trading Cards, and more. Transactions go through your Steam Wallet, so you can use your funds from selling in-game items to purchase various in-game items or even brand new Steam games.
How to Use the Steam Community Market – Ultimate Guide
The Steam Community Market is a digital marketplace where users can buy and sell certain in-game items and digital trading cards, emotes, profile backgrounds, and other things designed specifically for Steam.
Not all games support the Steam Community Market, and not all in-game items are tradable. If something is untradeable, it means that you cannot buy or sell it on the Steam Community Market. These items will be tagged as unsellable in your Steam inventory and will not have a sell button.
All sales on the Steam Community Market go through your Steam Wallet, a one-way digital wallet that you can use to make purchases on Steam. You can add funds to your wallet using methods such as PayPal and credit cards. Because the wallet is a one-way street, you cannot withdraw funds from it and transfer them elsewhere.