What does impressions mean on YouTube?

Impressions Once your video is published, YouTube starts surfacing it to relevant audiences, based on their behavior on YouTube (like what they watch, don’t watch, what they search for, etc.). When a viewer comes across your video thumbnails on YouTube, it’s called impressions, that is, how many times your video thumbnails are shown on YouTube.
For More Information Please Refer:
https://creatoracademy.youtube.com/page/lesson/analytics-impressions
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