The "Terms of Service" (often abbreviated as TOS) is a legal agreement between a service provider and its users. It outlines the rules and guidelines that users must follow when using a service, such as a website or app. This document typically includes information about user rights, responsibilities, and limitations of liability. By agreeing to the TOS, users consent to abide by the specified terms, which may cover issues like account creation, content ownership, and dispute resolution. It's important for users to read and understand these terms, as they govern the relationship between the user and the service provider, such as social media platforms or online marketplaces.