A terms of use is an agreement that a user must agree to and abide by in order to use a website or service. Terms of use (TOU) can go by many other names, including terms of service (TOS) and terms and conditions. Terms of use are often seen on e-commerce websites and social media websites, but it is not limited to those types of websites and should be used with any website that stores personal information of any kind. A terms of use that is legitimate is a legally binding agreement and is also subject to change, which should be noted in the disclaimer. Websites should always have a terms of use regarding user activity, accounts, products, and technology.