An all in one desktop does not have a separate tower to store, in fact the CPU, RAM and mother board in incorporated into the monitor itself. This helps you to save space.
A traditional desktop computer usually has a computer tower, monitor, mouse, and keyboard. An all-in-one desktop, however, tries to combine these. The actual computer will be inside of the (sometimes over-sided) monitor, and the monitor itself may include a touchscreen.
You will still usually want a keyboard, rather that trying to use the on-screen one, and a mouse my be useful as well. You will at least be able to do away with the computer tower, however.
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