Comprises knowledge of or skill in or observation of some thing or some event gained through involvement in or exposure to that thing or event. The history of the word experience aligns it closely with the concept of experiment.

The concept of experience generally refers to know-how or procedural knowledge, rather than propositional knowledge. Philosophers dub knowledge based on experience “empirical knowledge” or “a posteriori knowledge”. A person with considerable experience in a certain field can gain a reputation as an expert.