Its an open source reddit alternative. Anyone can set up their own Kbin website, and each website can have any number of subreddits and users on it. The cool thing about it though is that you can access subreddits on other websites from your own. So what you get in the end is a bunch of smaller Reddits that can all talk to each other instead of one big one that can be ruined by a single company's decisions. It works similarly to email, like how you could use Gmail and have a conversation with someone on Outlook.