Matching Collection is a term used to describe a SET of items that are similar in some way. It can refer to a group of objects, such as a collection of books or a SET of furniture, or it can refer to a group of people, such as a team or a group of friends. The term is often used in the context of collecting, where a person may have a matching collection of items, such as coins or stamps. The term SET is an acronym for the phrase 'Same Every Time, ' which is often used to describe a matching collection.