A Subreddit is a smaller forum within the social website reddit that is dedicated to a specific topic or theme. These are defined by the symbol “/r/” which precedes the unique Reddit url of that particular subreddit. There are large Subreddits like /r/politics or /r/videos. There are a multitude of Subreddits, and the Reddit homepage is composed of the most popular content from every Subreddit combined. A user's Reddit homepage can be customized by subscribing to favorite Subreddits.