Drawing tablets, also called graphics tablets, are different from tablet computers, like the iPad, the Microsoft Surface Pro, and other Android tablets. Those are computers by themselves, whereas drawing tablets work as peripherals to a PC or Mac.
If you’re looking for a standalone drawing tablet, you’ll need to look into the high-end display tablet range. Devices like the Wacom Mobile Studio Pro 13 and the Wacom Cintiq Pro 24 can function as a standalone Windows PC.
There are two kinds of drawing tablets: those with a built-in screen (what Wacom call pen displays), and those without a screen (pen tablets, as Wacom named them).
Drawing tablets without screen are more common than display tablets, partly because they’re more affordable. They function like large, sensitive trackpads, with the difference that you use a special pen, or stylus, instead of your fingertips.
Pen control is actually what sets a drawing tablet apart from working with a trackpad – or even a mouse. Drawing, painting and retouching is significantly easier with a pen on a tablet. You can draw natural, flowing lines and accurate circles – you generally just work as if you were using a pen and paper.