Usually comparable in size and weight to ultra portable or thin and light laptops, tablet PCs let you take handwritten notes and navigate menus, documents, and Web pages using a stylus directly on the screen. The most common type is the convertible tablet, which looks much like traditional a laptop but has a display that swivels 180 degrees and folds flat over the keyboard.
(Some manufacturers are incorporating this type of tablet functionality into larger middle size and thin and light laptops.) Slate tablets, on the other hand, lack keyboards they're all screen. The smallest tablets, ultra mobile PCs, bridge the gap between PDA and ultra portable, with 7 inch touch screen displays and enhanced media player features.
Once only the tool of specialized industries, tablets are gaining a wider audience, thanks to their portability, flexibility, and wow factor. To maximize battery life, notebook computer processors are often designed to save more energy and run cooler than desktop processors. The drawback is slower performance, but more memory can help, which it won't consume energy or radiate heat. Even better, up to 4GB of RAM can now be found in budget configurations. If you want more memory later, expansion is often a simple procedure.