Describe entities in the context of data models

What will be an ideal response?

An entity is something that the users want to track. Examples of entities are Order, Customer, Salesperson, and Item. Some entities represent a physical object, such as Item or Salesperson; others represent a logical construct or transaction, such as Order or Contract. Entities have attributes that describe characteristics of the entity. Example attributes of Order are OrderNumber, OrderDate, SubTotal, Tax, Total, and so forth. Entities have an identifier, which is an attribute (or group of attributes) whose value is associated with one, and only one, entity instance. For example, OrderNumber is an identifier of Order, because only one Order instance has a given value of OrderNumber.