Thumbnail
Definition
The clickable preview image of a video — arguably the single most important factor in whether someone watches.
A thumbnail is the preview image viewers see before clicking. On a crowded homepage it is the actual product — the video is what they get after.
Strong thumbnails have one focal point, high contrast, minimal text and curiosity that the title completes. They drive CTR. AI can generate concepts keyed to your video so you iterate instead of staring at a blank canvas.