Terms of service 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. Terms of service can also be merely a disclaimer, especially regarding the use of websites.

The Terms of Service Agreement is mainly used for legal purposes by companies which provide software or services, such as web browsers, e-commerce, web search engines, social media, and transport services.

A legitimate terms-of-service agreement is legally binding and may be subject to change.[2] Companies can enforce the terms by refusing service. Customers can enforce by filing a lawsuit or arbitration case if they can show they were actually harmed by a breach of the terms. There is a heightened risk of data going astray during corporate changes, including mergers, divestitures, buyouts, downsizing, etc., when data can be transferred improperly