A site that gathers content from all over the internet/community contributions based on specific categories. Content is voted on by users who created accounts by upvoting or downvoting the links that are posted and/or the comments within those threads. Part of the benefit of being a user there is that you can subscribe to whatever subreddits interest you to make the experience unique to you.

Like all sites, there are many downsides, and the community can be awful, but it's really not that hard to avoid the negativity, in my opinion.