A Terms of Service acts as a legally binding contract between you and your users. This is the agreement that sets the rules and guidelines that users must agree to and follow in order to use and access your website or mobile app. Terms of service (also known as terms of use and terms and conditions, commonly abbreviated as TOS or ToS, ToU or T&C) are the legal agreements between a service provider and a person who wants to use that service. The person must agree to abide by the terms of service in order to use the offered service.