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.