While a computer keyboard and a typewriter keyboard look similar, the underlying technology that controls how they work is completely different. The classic typewriter is a mechanic device. Pressing a key lifts a little hammer that hits a physical piece of paper, leaving the impression of whatever letter you have chosen on the paper. A computer keyboard is an electronic device connected to a silicon chip that is loaded with coded information. At its most basic, pressing the key sends a line of code to the computer telling it to display whatever letter is chosen on a computer screen. At this point, no physical object (beyond what you see on the screen) has been created and doesn't have to be. To obtain a physical print out, you would need to connect the computer to a printer, put paper in the printer and print whatever is one the screen out, a second step.
While getting a printed document entails a second step on a computer because the keyboard only produces an image on the screen, the electronic nature of the keyboard offers a range of options not available on a typewriter. For instance, fixing an error on a typewriter is a laborious physical process that involves painstakingly painting over the mistake with white-out and then retyping the letter in question. As we know, simple back-spacing on the computer keyboard allows you to start all over. You can also save documents in a computer's memory, a feature not allowed on a classic typewriter, format them in different ways, and change fonts and spacing, just for starters.