Keyboard is a standard input device which is used to feed data into the computer and to control its operation. The Mouse is a hand-held device that allows the user to control the movement of the cursor on the monitor screen. A keyboard can either be internal or external. Internal keyboards are for Laptops only, while External keyboards can be used with Laptops, desktops, and servers. External keyboards are available with either PS2 or USB interface connections. The compatibility and interface connection type for this keyboard are listed in the technical specification section of this page. The number of keys in a keyboard determines the total characters and operations that can be carried out. The interface type determines the compatibility of the keyboard and the mouse with your system. Some of the keyboards are wireless. Keyboards can also come in different languages with the corresponding Language character Keys. The mouse typically has two buttons and a wheel feature. The wheel feature allows to easily scroll up or down within the active window.