Final answer:
A hypothesis is an educated guess used to explain observations or predict future events, which can be tested through scientific experimentation.
Step-by-step explanation:
An educated guess about the relationship between things or about what will happen in the future is called a hypothesis. It is a testable, educated guess that serves as a tentative explanation for observations and can be used to make predictions that can be scientifically tested. An observation, on the other hand, is simply the act of seeing what happens without necessarily making a guess or prediction.
When formulating a hypothesis, scientific knowledge and observations are used to develop a suggested solution or explanation. A hypothesis must be able to be tested and should be able to predict what will happen in a given situation, allowing it to be either validated or refuted by experimentation and further observation.