What is minimal superkey?

A minimal superkey is a type of superkey in a relational database that uniquely identifies a record within a table, and it has no unnecessary attributes. In other Words, it is a superkey from which no subset can serve as a superkey, meaning that if any attribute is removed, it will no longer uniquely identify the records. Minimal superkeys are also referred to as candidate keys, as they can potentially be chosen as the primary key for the table.