Computer Fundamentals and System Concepts

Spyware is malicious software designed to secretly monitor and record your computer activities, such as keystrokes, browsing history, and personal information, and transmit this data to a third party. While some advanced spyware can access webcams, its primary definition and design goal is to record and harvest user activity. It does not ignore the user or solely focus on creating backdoors.

Computer viruses are malicious programs that spread by inserting their code into legitimate programs, documents, or files. When a user opens or runs the infected host file, the virus code is executed and can infect other files on the system. They do not typically attach themselves to raw network packets of data or simple desktop icons.

A computer worm is a standalone malware program that replicates itself in order to spread to other computers, often consuming immense amounts of system memory or network bandwidth in the process. Unlike Trojans, which rely on tricking users into running them, or spyware, which quietly steals data, worms are characterized by their self-replicating and resource-consuming nature.

Displaying information, such as viewing an image on a monitor, is an output operation because the computer is presenting processed data to the user. Input operations involve sending data into the computer, processing involves manipulating that data, and storage involves saving it for future use.

An input operation occurs when a computer system accepts data or instructions from an external source, such as a user typing on a keyboard. Displaying data is an output operation, while performing calculations and running programs are processing operations.

The processor (CPU) is installed directly into a socket on the motherboard, which acts as the central hub connecting all components. While the hard disk, monitor, and keyboard connect to the motherboard via cables or ports, they are separate peripheral or storage devices.

The fundamental sequence of computer operations is the Input-Process-Output (IPO) cycle. First, the computer receives data (input), then it manipulates or calculates that data (process), and finally, it presents the results to the user (output).

The motherboard is the main printed circuit board in a computer that houses the CPU, memory, and connectors for other peripherals. It serves as the central backbone, allowing all hardware components to communicate with one another.

The processor, or Central Processing Unit (CPU), is responsible for executing program instructions and performing arithmetic and logical calculations. The hard disk and RAM are used for long-term and short-term data storage, respectively, while the monitor is an output device.

An operating system is a type of system software that manages computer hardware and software resources. Keyboards, RAM, and mice are physical components, which classifies them as hardware.

Software consists of the programs, data, and instructions that tell a computer how to perform specific tasks. Hardware, on the other hand, refers to the physical components of the system.

Hardware represents the physical, tangible components of a computer system that you can see and touch. Software is intangible and consists of digital instructions and programs.

A botnet is a network of private computers infected with malicious software and controlled as a group without the owners' knowledge, often used to perform large-scale cyberattacks. A virus is a single self-replicating program, and Stuxnet is a specific historical worm.

Computer viruses are malicious software programs that can affect various components of a computer system. They can corrupt files on the hard drive, occupy space in the RAM to slow down performance, and intercept keystrokes from the keyboard. Therefore, they can affect all of these components.

A Trojan Horse is a type of malware disguised as legitimate software to deceive users into downloading and executing it. Unlike viruses or worms, they do not replicate or attach themselves to other files.