A subreddit is a specific online community within the 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, comment on others' posts, and vote on submissions to determine their visibility. Subreddits are moderated by volunteers who enforce community rules and guidelines. They can vary in size and focus, ranging from broad subjects like r/news to niche interests like r/knitting. This structure allows users to engage with content that aligns with their preferences and hobbies.