OStatus is an open standard for decentralized social networking that allows different platforms to communicate with each other. It enables users on one platform to follow and interact with users on another, promoting a more interconnected online experience. The protocol consists of several components, including ActivityStreams, WebFinger, and Salmon, which work together to facilitate the sharing of updates and messages. By using OStatus, users can maintain their privacy and control over their data while still engaging with a broader community across various services.