It displays the images that the computer generates. And it projects a visual representation of the work being done on the computer. If you've got output that needs to be heard, then you need a speaker to project the sound being generated by the computer. The Walk-Through Computer uses a bubble jet printer. Other types of printers are dot matrix printers and laser printers.
Software is the instructions that tell the computer what to do.
Software is also called a computer program. Software can be a game, a word processing program, or an Internet browser. Software is written in computer languages. The smallest unit of information in binary code is called a bit. Eight bits make a byte.