The definition of purpose is to address the needs of a group or an individual, an example of this is a company such as Dodge. The system's purpose is the reason that the information system exists, and is used to measure how successful the system is in use. The information system is used to solve a problem, and provides benefits for the users.
The purpose of the information system is to adress the needs which Dodge has as a company, and this includes:
Deciding on the future of the company, such as what type of vehicles to sell the future, and what trends are going to make them money.
Assisting customers with their purchasing of vehicles, and service/maintainence of those vehicles.
Developing and improving the quality of vehicles, and solving past problems.
Improving efficiency of the company, and the speed at which they work.