Once you have selected the views, you can:

Select USA or wordwide views

Customize the number of views per day
Fast views, as its name suggests, have a higher frame rate. Views can be up to 1,000,000 views per day!
("Youtube Premières" is supported).
Real views
Retention views have a longer viewing time and allow you to facilitate the referencing of your Youtube videos. They will therefore be more likely to be better placed in Youtube searches based on your keywords.