noun
still image; static image
Refers to a single, non-moving picture, as opposed to video or animation. Common in digital media and photography contexts.
このカメラは静止画と動画の両方が撮れます。
This camera can capture both still images and video.
プレゼンに静止画を挿入した。
I inserted a still image into the presentation.
写真 specifically means 'photograph', while 静止画 is a broader term for any still picture, including digital graphics.
Compound of 静止 (seishi, 'stillness') and 画 (ga, 'picture').