Final answer:
A theory is a comprehensive explanation for observed phenomena backed by a wide range of experiments, with substantial validity supported by many observations.
Step-by-step explanation:
A theory is a well-developed set of ideas that propose an explanation for observed phenomena. This explanation is supported by a wide range of observations and experiments, which give it a high level of validity. It is more than just a collection of educated guesses; it's an overarching explanation that ties together various empirical findings. If the theory consistently provides accurate predictions and stands up to rigorous testing across multiple experiments and observations of the world, then it is considered 'likely to be accurate.' Contrary to a hypothesis, which is a tentative explanation subject to testing and potential disproof, a theory has undergone extensive testing and has been substantiated by a substantial body of evidence, sometimes referred to as the 'theory of theory' in science. This indicates that there is an overwhelming amount of evidence supporting its correctness.