Reddit is a social media platform and online community where users can submit content, such as text posts, links, images, and videos. The site is organized into various "subreddits," which are individual communities dedicated to specific topics or interests. Each subreddit has its own rules and guidelines, and users can join, contribute to, and follow the subreddits that interest them.

Content on Reddit can be upvoted or downvoted by users, affecting its visibility. Highly upvoted content rises to the top of the subreddit or even the site's front page, while downvoted content becomes less visible. Users can also comment on posts, creating threaded discussions. Reddit is known for its diverse and active user base, covering a wide range of topics from news and hobbies to niche interests and support groups.