Difference: A theory, in contrast, is a principle that has been formed as an attempt to explain things that have already been substantiated by data. It is used in the names of a number of principles accepted in the scientific community, such as the Big Bang Theory. Because of the rigors of experimentation and control, its likelihood as truth is much higher than that of a hypothesis.
A hypothesis is usually tentative, an assumption or suggestion made strictly for the objective of being tested.
Simlarties: A hypothesis is either a suggested explanation for an observable phenomenon or a reasoned prediction of a possible causal correlation among multiple phenomena. In science, a theory is a tested, well-substantiated, unifying explanation for a set of verified, proven factors.
