In Today's lecture, I will cover the Introduction to Cyber Security of subjectCyber Security which is one of the Important subjects of professional courses.

Information systems: Information systems are the software and hardware systems that support data-intensive applications. Such a system may be as simple as a 3x5 card catalogue system on a desk, or a desktop calendar. Or, it may be as complicated as a multi-node computer database system used to manage vast quantities of related information.

The six components that must come together in order to produce an information system are:

  1. Hardware: The term hardware refers to machinery. This category includes the computer itself, which is often referred to as the central processing unit (CPU), and all of its support equipment. Among the support equipment’s are input and output devices, storage devices and communications devices.
  2. Software: The term software refers to computer programs and the manuals (if any) that support them. Computer programs are machine-readable instructions that direct the circuitry within the hardware parts of the system to function in ways that produce useful information from data. Programs are generally stored on some input/output medium, often a disk or tape.
  3. Data: Data are facts that are used by programs to produce useful information. Like programs, data are generally stored in machine-readable form on disk or tape until the computer needs them.
  4. Procedures: Procedures are the policies that govern the operation of a computer system. "Procedures are to people what software is to hardware" is a common analogy that is used to illustrate the role of procedures in a system.
  5. People: Every system needs people if it is to be useful. Often the most overlooked element of the system is the people, probably the component that most influence the success or failure of information systems. This includes "not only the users, but those who operate and service the computers, those who maintain the data, and those who support the network of computers."
  6. Feedback: it is another component of the IS, that defines that an IS may be provided with feedback (Although this component isn't necessary to function).