The entity set specifies the collection of all entities of a particular entity type in the database. An entity set is known as the set of all the entities which share the same properties.

For example, a set of people, a set of students, a set of companies, etc.

An entity set in the context of a database management system (DBMS) is a collection of similar types of entities. An entity, in this context, represents a real-world object or concept that can be uniquely identified. For example, in a university database, the “Student” entity set may contain all the individual students enrolled in the university, where each student is a distinct entity within the set. Similarly, the “Employee” entity set could contain all the employees of a company. Essentially, an entity set is a grouping of entities that share common attributes and characteristics.