Computer is an one of the useful inventions of science. It can ease our works and takes less time. It consist different parts include keyboard, mouse, scanner, speakers, etc. A computer scanner is the device that enable us to scans images, handwriting, printed texts, etc. It is the device used in computer science, electronics, and medicine for the exploration of documents or images, spaces, and the human body. There are different types of computer scanner- Bar code scanner, Scanner for diagnosis and Body Scanner.