A mobile device is a general term for any type of handheld computer. These devices are designed to be extremely portable, and they can often fit in your hand. Some mobile devices - like tablets, e-readers, and smartphones -- are powerful enough to do many of the same things you can do with a desktop or laptop computer. Tablet computers Like laptops, tablet computers are designed to be portable. However, they provide a different computer experience. The most obvious difference is that tablet computers don't have keyboards or touchpads. Instead, the entire screen is touch-sensitive, allowing you to type on a virtual keyboard and use your finger as a mouse pointer. Tablet computers can't necessarily do everything traditional computers can do. For many people, a traditional computer like a desktop or laptop is still needed in order to use some programs. However, the convenience of a tablet computer means it may be ideal as a second computer. E-readers E-book readers - also called