Theory is the body of principles, ideas ,rules, and techniques which applies to a specific subject. Theories can contain facts and laws and tested hypotheses .It can be derived from the expressions of a system. In fact , theory is appeared after hypothesis in scientific method it is an acceptance about a subject in a particular field but it is not just a guess it should be well-substantiated knowledge. Moreover, theory has many different meanings depending on their methodologies.
http//en.wikipedia.org/wiki/theory
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