Computer:- A computer is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.
Computer Hardware:- It is the collection of physical parts of a computer system. This includes the computer case, monitor, keyboard, and mouse. It also includes all the parts inside the computer case, such as the hard disk drive, motherboard, video card, and many others.
Computer Software:- Computer software, often called software, is a set of instructions and its associated documentation that tells a computer what to do or how to perform a task. The software includes all different software programs on a computer, such as applications and the operating system.
System Software:- System software coordinates the activities and functions of hardware and software, and it controls the operations of computer hardware. A computer's operating system is an example of system software. Operating systems control the computer hardware and act as an interface with application programs.
Application Software:- An application is any program or group of programs, that is designed for the end user. Applications software include such things as database programs, word processors, Web browsers and spreadsheets. It also called end-user programs.