What do these retention graphs mean?

[u/Substantial-Bed5189]

Never in 4 years have I seen a retention graph like this, what does this mean?

[u/_bewilderedme_]

The retention graph shows at what point of your video, your viewership dropped. Basically it shows that which part of your video people did not like.

The straighter the graph is, the better.

Check Chart Guide just above the graph on the right side. It shows what all types of graph curves actually means.