A business rule is a rule of a business, company, or corporation. It is a rule that defines or constrains some aspect of business
and always resolves to either true or false. Business rules are
intended to assert business structure or to control or influence the
behavior of the business.
Business rules describe the operations, definitions and constraints
that apply to an organization. Business rules can apply to people,
processes, corporate behavior and computing systems in an organization,
and are put in place to help the organization achieve its goals.
For example a business rule might state that no credit check is to be performed on return customers.
Other examples of business rules include requiring a rental agent to
disallow a rental tenant if their credit rating is too low, or requiring
company agents to use a list of preferred suppliers and supply
schedules.
While a business rule may be informal or even unwritten, writing the
rules down clearly and making sure that they don't conflict is a
valuable activity. When carefully managed, rules can be used to help the
organization to better achieve goals, remove obstacles to market
growth, reduce costly mistakes, improve communication, comply with legal
requirements, and increase customer loyalty.
Source: Wikipedia
