A Steam client beta is a pre-release version of Steam’s desktop application. It lets Valve test changes with participating users before features are made available more broadly. Beta builds may include new interface options or tools for organizing game information, such as achievement sets.
Beta software can contain unfinished features or bugs, so availability and behavior may change. In cyber security, pre-release software is relevant because testing exposes new code and functionality before general rollout; users should install beta builds only through official channels and keep the client updated. The term describes a testing version, not a separate security service or a guarantee that a feature is final.