A subreddit is a specific community within the online platform Reddit, where users can discuss topics of shared interest. Each subreddit is identified by its unique name, prefixed with "r/", such as r/technology or r/cooking. Users can post content, ask questions, and share information related to the subreddit’s theme. Subreddits are moderated by volunteers who enforce community rules and guidelines. They can vary in size, from small groups with a few hundred members to large communities with millions. Users can subscribe to subreddits to see their posts in their personalized feed, making it easier to engage with topics they enjoy.