What is meant by empirical evidence?

Empirical evidence is an observed phenomenon that appears the same to all observers. In science, evidence is never "proven true," nor is any hypothesis or theory. Scientific information is only considered valid until further evidence is observed that contradicts the hypothesis, theory, or interpretation of previous evidence. Therefore, the concept of proof is not a part of science. It is a valid concept in mathematics and law, but not science in its strictest sense. This reliance on empirical evidence is one of several measures that maintain science as a self-correcting means of studying and learning.