Tracking
Formal
A technology that allows a device to estimate its position relative to the environment around it. In augmented reality, tracking is the method by which a computer anchors content to a fixed point in space, allowing users to walk and/or look around it.
Practical
In augmented reality, tracking is the method by which a computer anchors content to a fixed point in space, allowing users to walk and/or look around it, as defined by the degrees of freedom allowed by the display device. In marker-based tracking, computers recognize a two-dimensional image or code on which it anchors the content. In markerless tracking, the computer uses some other mapping technique (usually SLAM) to determine a surface on which to anchor content.
