ASP.Net MVC What is Donut Caching

Question

i know output cache which is used to cache partial view like

ChildActionOnly]
[OutputCache(Duration = 10)]
public PartialViewResult PartialViewCacheChild()
{
    return PartialView("_PartialViewForCache");
}

Donut Caching is different from [OutputCache(Duration = 10)] ?

how to cache my main full view ?

what is Donut Caching and what is its advantage?

please guide me. thanks