The document summarizes key parts of a computer: 1. The monitor displays images generated by devices like computers without producing a permanent record. Modern monitors use LCD displays while older ones used CRT. 2. The CPU, or central processing unit, executes computer programs. Early CPUs were custom designed but now most use mass produced standardized processors. 3. The keyboard allows input by pressing keys that typically correspond to letters, numbers or symbols. It is used to type text into programs.