When a hypothesis is testable, it means that it's possible to see whether the prediction is true or not. Testing a hypothesis can include conducting experiments, collecting data and making observations.

For example:

• ''Blue light makes plants grow faster than red light'' is a testable hypothesis because it can be proven or disproved by way of experiments.
• ''Pizza is the best food'' is not a testable hypothesis because you cannot conclusively prove or disprove the statement.