Eye tracking is the process of measuring either the point of gaze ("where we are looking") or the motion of an eye relative to the head. An eye tracker is a device for measuring eye positions and eye movement. Eye trackers are used in research on the visual system, in psychology, in cognitive linguistics and in product design. There are a number of methods for measuring eye movement. The most popular variant uses video images from which the eye position is extracted.
Questions having the eye-tracking tag regards testing and the result of testing using the eye tracking method.
Reference: http://en.wikipedia.org/wiki/Eye_tracking
