What purpose does SectionFeed serve?

SectionFeed is a component used to automatically feed articles into sections. This might save the user some work. For instance if you have a section with several sub sections, and you want the parent section to always have the latest articles from all sub sections you could use a feed.

Lets say you have section structure like this: the section Sport with the sub sections Golf, Tennis and Football. Then you could create a feed that will automatically cross publish articles to Sport that are published into either one of the sub sections.