Question Discussion & Solution

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URL stands for Uniform Resource Locator, and is used to specify addresses on the World Wide Web. A URL is the fundamental network identification for any resource connected to the web.

Mouse : A computer mouse with the most common features: two buttons (left and right) and a scroll wheel, which can also act as a third button. A computer mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface. The first public demonstration of a mouse controlling a computer system was in 1968. Originally wired to a computer, many modern mouse are cordless, relying on short-range radio communication with the connected system. Mouse originally used a ball rolling on a surface to detect motion, but modern mouse often have optical sensors that have no moving parts. In addition to moving a cursor, computer mouse have one or more buttons to allow operations such as selection of a menu item on a display. Mouse often also feature other elements, such as touch surfaces and "wheels", which enable additional control and dimensional input.

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A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.