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. Terms of service can also be merely a disclaimer, especially regarding the use of websites. Vague language and lengthy sentences used in the terms of use have brought concerns on customer privacy and raised public awareness in many ways. Usage 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. 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. Content A terms of service agreement typically contains sections pertaining to one or more of the following topic: Disambiguation/definition of key words and phrases User rights and responsibilities Proper or expected usage; definition of misuse Accountability for online actions, behavior, and conduct Privacy policy outlining the use of personal data Payment details such as membership or subscription fees, etc. Opt-out policy describing procedure for account termination, if available Sometimes contains an Arbitration clause detailing the dispute resolution process and limited rights to take a claim to court Disclaimer/Limitation of Liability clarifying the site's legal liability for damages incurred by users User notification upon modification of terms, if offered Among 102 companies marketing genetic testing to consumers in 2014 for health purposes, 71 had publicly available terms and conditions: 57 of the 71 had disclaimer clauses (including 10 disclaiming liability for injury caused by their own negligence) 51 let the company change terms (including 17 without notice) 34 allow data disclosure in certain circumstances 31 require consumers to indemnify the company 20 promise not to sell data Among 260 mass market consumer software license agreements in 2010: 91% disclaimed warranties of merchantability or fitness for purpose or said it was "As is" 92% disclaimed