A hypothesis is an "educated guess". An example of how it could be used: John needed to test his hypothesis about molecular degenaration.
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It is testable and falsifiable
Observation Experament Hypothesis
Usually the current 'answer' to a scientific problem would be called a theory. However when used in an experiment people refer to the current answer to a problem as the nul hypothesis and the new, to be tested, theory as the alternative hypothesis.
The hypothesis drives the investigation.
Discovery science is mostly about describing nature, whereas hypothesis-driven science tries to explain nature.