What is the need for Business component in QTP ? (this is something related to Test director)

What is the need for Business component in QTP ? (this is something related to Test director)

Business components are parts of a business process that has been broken down into smaller parts. For example, in most applications users need to log in before they can do anything else. A business analyst can create one component that represents the login procedure for an application. Each component can then be reused in different business process tests, resulting in easier maintenance, updating, and test management.

Components are comprised of steps. For example, the login component's first step may be to open the application. Its second step could be entering a user name. Its third step could be entering a password, and its fourth step could be clicking the Enter button.

You create and edit business components by recording steps on any supported environment, adding checkpoints and output values, parameterizing selected items, and enhancing the component with flow statements, user-defined functions, and other VBScript programming statements. Components can also be created in Quality Center with Business Process Testing support. A business analyst combines business components into business process tests, which are used to check that the Web site or application behaves as expected.