what is impression in youtube

Impressions on YouTube refer to the number of times a videos thumbnail is seen on YouTube. An impression is counted every time a video thumbnail is at least 50% visible on a users screen for over 1 second on YouTube. Impressions are important because they give an indication of how many people are seeing a videos thumbnail and how effective it is in reaching potential viewers. Impressions are counted if the thumbnail is shown for more than 1 second and at least 50% of the thumbnail is visible on the screen. Impressions are limited to thumbnail views only and dont include video clicks or views. Impressions can be tracked through the YouTube app or YouTube Studio app for Android. The "Impressions and how they led to watch time" report in YouTube Studio provides a visual of a videos thumbnail impressions that led to views and watch time.