Many businesses continue to face a backlog of two to three years in developing the information systems they need, or they will not be able to develop them at all. System software and application software are two major types of software. PC software is based on specific operating systems and computer hardware. The development of a database requires organizational and conceptual change. LANs are especially vulnerable to network disruption, loss of essential data, access by unauthorized users, and infection from computer viruses.
Telecommunications is the communication of information by electronic means.
An analog signal is a discrete, rather than a continuous, waveform. Most computers communicate with analog signals. Advantages of wireless networks include being less expensive, faster, and having fewer errors than wired networks. Star, bus, and ring are the three most common topologies. Referencing the Internet, all the data, including e-mail messages, databases, and Web sites, are stored on clients.