Glossary
What is YouTube algorithm?
The YouTube algorithm is the system that decides which videos to recommend to each viewer.
YouTube algorithm explained
Rather than one formula, YouTube’s recommendation system looks at what viewers watch, what they skip, how long they stay and how satisfied they seem. Its goal is to match each viewer with videos they’re likely to enjoy.
Your thumbnail influences the first step — whether someone clicks when your video is shown. A clear, honest thumbnail that earns clicks from the right viewers gives the system good signals.
Why it matters for thumbnails
Thumbnails are the first thing viewers see, so they influence how youtube algorithm plays out on your channel. Read our thumbnail best practices to put this into practice, or browse the rest of the glossary.
Make your next thumbnail in minutes
Tell the AI agent what your video is about — it proposes a thumbnail, you approve it, and you can tweak it by asking.
Keep exploring
Impressions
An impression is counted when a video’s thumbnail is shown to a viewer on YouTube.
Learn more →Click-through rate (CTR)
Impressions click-through rate is the share of thumbnail impressions that turned into views.
Learn more →Watch time
Watch time is the total amount of time viewers have spent watching your videos.
Learn more →