What does it mean that a hypothesis must be ‘falsifiable’ in order to be valid?

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A hypothesis must be able to be proved wrong for it to be a useable hypothesis.

Explanation:

This is because if one can not disprove a hypothesis no experiment can be preformed to test the truthfulness of the statement. this does not mean that the question is not interesting or not worth asking. For example "There is a god" is an example of a hypothesis which is not falsifiable; whether or not this statement is true is still valuable information but it is not possible to answer using the tools of science.

If an experimental observation can be made that disproves a hypothesis or model, it is said to be falsifiable. That is, one of the possible outcomes of the planned experiment must be a result that would contradict the hypothesis if achieved..

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one would be wind another would be water density