According to Youtube, the overview report is a high-level summary of how your content is doing on Youtube. This report is put together so that any content creator is able to quickly and easily view performance metrics. There are five sections that make up the overview report: Performance Metrics, Engagement Metrics, Top 10 Content, Demographics, Discovery.
The first section, Performance Metrics, summarizes watch time, views, and earnings, if applicable by the specific content. The second, Engagement Metrics, displays the most relevant data for different engagement criteria. Such as likes, dislikes, comments, shares, and favorites. Third is the top 10 content, this tool shows the top 10 pieces of content for your channel, such as channels, playlists, and assets, according to watch time. the fourth layer of the overview report are the demographics, which gather location on gender and location of viewers. The fifth and final tool of the overview report is Discovery, this summarizes the metrics for top playback locations and top traffic sources by watch time.
Youtube provides all these different tools within this overview report to allow content creators the ability to easily monitor how well their content is doing on Youtube. These content creators will find this incredibly helpful in that the report gives early insights on a videos performance, and can be used to adjust how that specific video is being promoted.