Basics. Hypothesis Testing: For A theory to be proven true or possible, it must be FALSIFIABLE. It means a claim (hypotheses, or theory) can be tested; subject to experiment. It means it allows for the possibility of more accurate explanations to be considered & formulated. It's important because it helps us progress.
UNFALSIBIABILITY. Confidently asserting that a theory or hypothesis is true or false even though the theory or hypothesis cannot possibly be contradicted by an observation or the outcome of any physical experiment, usually without strong evidence or good reasons.