PTZ is an abbreviation for Pan-Tilt-Zoom. PTZ cameras can pan, tilt and zoom.
To pan means rotating horizontally while maintaining a fixed position. The pan motion is similar to the motion of moving the head left or right.
To tilt means rotating vertically up and down while maintaining a fixed position.
Zooming changes the focal width of the camera and thus the field of view.
Video analytics can be used to pan, tilt and zoom automatically to follow objects.