Reddit is a social news site where users submit posts in the form of either a link or a text "self" post. Other users then vote the submission "up" or "down," which is used to rank the post and determine its position on the site's pages and front page.
Example Use Case:
You're interested in the most popular breaking news stories. You select Reddit as your data source because it's a voting site. You can rely on Reddit's user community to identify the content that matters most.