Recently was asked what the View's types in YouTube's Insights tool mean. Shows up in tables as "Source of Views". I did some searching and couldn't find any simple list or definitions.
Did some digging and here's the results of my analysis.
|embedded player view on another site|
|YouTube Channel Page Player||player on channel page - featured video|
|Youtube Other||played on youtube directly from navigating to page|
|Advertising||played for advertisment on youtube|
|Related Video||Showed up as related video to another video and was played|
|Mobile Devices||played on mobile device player|
|External Links||external site linking directly to video player page|
|Viral/Other||No referrer - direct navigation to video|
|YouTube Search||found via youtube search|
|Google Search||found via google search|
|Google Video Search||found via google video search|
|Subscriber||played within my account/subscriptions module|
From the all videos' view you can drill down to a specific video, and from there go to the "Discovery" section for that video. Once looking at "Discovery" for a specific video these headings allow you to drill down and see the exact sites that were creating the traffic.
Since this was originally posted, YouTube has updated Insight. Here's what you now see in YouTube: