Terms Of Service or ToS – are rules which one must agree to abide by in order to use a service. Terms of Service can also be referred to as Terms of Use or sometimes merely a Disclaimer, especially regarding the use of websites.
Certain websites are noted for having carefully designed terms of service, particularly eBay and PayPal, which need to maintain a high level of community trust because of transactions involving money. Terms of service can cover a range of issues, including acceptable user behavior online, a company’s marketing policies, and copyright notices. Some organizations, such as Yahoo!, can change their terms of service without notice to the user base.
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Source: Wikipedia
The Computer Savvy Weblog 