C# Business Objects

Business objects are objects in an object-oriented computer program that abstract the entities in the domain that the program is written to represent. For example, an order entry program needs to work with concepts such as orders, line items, invoices and so on. Each of these may be represented by a business object.
Business objects are sometimes called domain objects (where the word domain means the business), and a domain model represents the set of domain objects and the relationships between them.
Business objects often encapsulate all of the data and business behavior associated with the entity that it represents.
Business objects don't necessarily need to represent objects in an actual business, though they often do. They can represent any object related to the domain for which a developer is creating business logic. The term is used to distinguish between the objects a developer is creating or using related to the domain and all the other types of object he or she may be working with such as user interface widgets and database objects such as tables or rows.