The first global electronic network was the Internet. Today there are also new Internet subsystems called an intranet and an extranet. While computer users may use all three systems throughout a single day, there are some similarities and differences among them that are important. To aid in understanding these three systems, let us use the example of a computer-using employee, Sally, in an automobile dealership. Sally might use the Internet to check flight schedules to plan for an upcoming sales meeting. Sally might also use the intranet to check on a shipment of cars for the automobile dealership. Sally could also use the extranet to check the latest wholesale pricing of tires.

Definitions and Relationships

Internet Although the Internet has existed for more than a quarter of a century it is now used widely in schools, homes, and workplaces. The CMP Net Online Encyclopedia defines Internet...