Alpha 910 — Full-Frame Camera Bodies Compared | alpha910.com
A global shutter reads the whole sensor at once; a rolling shutter reads it row by row and skews what moves.
Sony describes the Alpha 9 III as the world's first camera with a global shutter full-frame image sensor.
The read-out happens for the entire sensor in one go, which removes rolling-shutter distortion from stills and from video.
Fast subjects are where the difference shows: bats, balls and splashes cross the frame while a rolling shutter is still reading, and each row holds a different instant.
On narrow screens, swipe or scroll the plate sideways.
Flash work changes as well, because synchronization is possible at shutter speeds up to 1/80,000 second on this body.
The same sensor allows blackout-free continuous shooting at 120 fps with full AF/AE tracking, so the viewfinder does not go dark between frames.
Which of these figures you can quote side by side is the subject of the specification reading page.
Further reading