Definition & Meaning of "the proof of the pudding is in the eating"in English

What is the origin of the proverb "the proof of the pudding is in the eating" and when to use it?

The proverb "the proof of the pudding is in the eating" can be traced back to the early 17th century, with a version of the saying appearing in William Camden's 'Remains Concerning Britain' (1605). The proverb suggests that the true value or quality of something can only be determined by experiencing it, rather than judging by appearance or assumption. It emphasizes that results or outcomes are the true indicators of worth. The proverb serves as a reminder that practical experience or the final result is more revealing than theory or expectations.