Imagine keeping your feet planted while tipping your head up to see a building's roof. The camera rotates vertically, so the horizon and visible parts of the building shift within the frame.
Keyframe the tripod's tilt axis or the virtual camera's pitch while keeping its center position and roll level. Looking upward can still make a building's vertical edges converge toward the top because of perspective.
A tilt changes the viewing direction; a pedestal changes camera height. Rotating the whole frame is a roll, so keep those moves distinct.
When to use
Use it to reveal a person's or structure's height or guide the viewer's gaze vertically. A long move can make the destination feel unclear.