What is meant by "tracking" and "markers"?

Tracking is the technique of recognizing images, objects, structures and surfaces.

Image recognition is used for photos or graphics that are also referred to as markers.

3D objects is the capacity to recognize a machine and links spatial information to it. This is then called object tracking – and amazing, btw.

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What is Voice controlled navigation?
What is "SLAM"… sounds a bit aggressive… What does this have to do with AR?