Computers are often part of a network of computers that allows connected computers to exchange information. Networked computers can access data and other resources from other computers on the network. Although computer networks create a powerful and sophisticated computing environment, networks also complicate computer security.
For example, within a network of computers, individual systems allow the sharing of information. Unauthorized access is a security risk. Because many people have access to a network, unauthorized access is more likely, especially through user error. A poor use of passwords can also allow unauthorized access.