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Most are installed inside the computer. Depending on which type of computer you have (Desktop, Tower, Laptop) it may or may not be easily accessible.
full tower
A tower is the part of the computer which all the main devices are located. The tower is where you first turn your computer on. A desktop is the same thing, a desktop consists of a Tower, Monitor, Keyboard, Speakers, and a Mouse.
tower
One difference between a desktop and a laptop is that a laptop is portable while a desktop is stationary. Laptops are usually smaller and can run off of battery power while a desktop is bigger and has to be plugged in to work.
The two common designs for a desktop computer are tower desktops and table desktops. Choice between these depends on work area space availability.
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.
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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Desktop Tower Defense happened in 2007.
A desktop computer is a computer that is too big to lug around and be called a laptop. It involves a "tower" and a "monitor". They are great because they are generally more powerful then laptops and much cheaper.
Two common designs for desktop computer are1 Horizontally oriented system unit2 Vertically oriented tower