What does being testable and falsifiable means?

Falsifiability or refutability is the logical possibility that an assertion can be contradicted by an observation or the outcome of a physical experiment.

Testable is if you canTestability, a property applying to an empirical hypothesis, involves two components: (1) the logical property that is variously described as contingency, defeasibility, or falsifiability, which means that counterexamples to the hypothesis are logically possible, and (2) the practical feasibility of observing a reproducible series of such counterexamples if they do exist