People can easily identify 4 major functions are input, processing, output and storage in a computer from the following picture. On this post, I show each function in detail by 4 categories.
1. Input: allow users to put the data in the computer, such as mouse, keyboard and stylus.
Keyboard is obviously allow and help people to input data to computer. It is a typewriter-style device that can use to type text and numbers in to a word processor, text editor or gaming.
2. Process: Manipulates, calculates, or organizes data into information, like CPU
A central processing unit(CPU) is the hardware in a computer. It carries out the instrucions of a computer program by operating locial, basic arithmetical, input and output in computer system.
3.Output: Displays data and information for people, like printers and screens.
A printer is output function for computre, because it produces a representation of an electronic document on physical media suan as paper or transparency film.