Whats the differance between an affiliate site and a sister site?

Question: could any one tell me the true meaning of each, like what does a sister site do or what does the affiliate sit do.. im confused

Answers:
An affiliate is a business partner.
A sister site is a company "twin".

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An affiliate site would be a mutal agreement between two parties, or companies where neither company has any direct vested intrest in another (such as money or stock). A sister site would be a financial agreement between two parties or companies where cash/stock has been exchanged.

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