The first computer mouse
In the context of computing, a mouse (plural (generally): mice, also mouses) consists of a hand-held pointing device, designed to sit under one hand of the user and to detect movement relative to its two-dimensional supporting surface. In addition, it usually features buttons and/or other devices, such as "wheels", which allow the user to perform various system-dependent operations. Extra buttons or features can add more control or dimensional input.
The mouse's 2D motion typically translates into the motion of a pointer on a display.
The name "mouse", coined at the Stanford Research Institute, derives from the resemblance of early models (which had a cord attached to the rear part of the device, suggesting the idea of a tail) to the common small rodent of the same name.
Because the computer mouse has long dominated the world of pointing devices in computing, people often refer to any generic computer pointing-device as a mouse