noun
Computing term for resizing or changing the magnification of a display, image, or interface element.
このソフトは画像の拡大縮小が簡単にできます。
This software makes it easy to scale images.
地図アプリで拡大縮小するにはピンチ操作を使います。
To zoom in and out on the map app, use a pinch gesture.
Compound of 拡大 (enlargement) and 縮小 (reduction), directly describing the combined concept of scaling up and down.