reddit is a social news website where users can post links to content on the web. Other users may then vote the posted links up or down, causing them to appear more or less prominently on the reddit home page. The site has discussion areas where users may discuss the posted links, and vote for or against others' comments. When there are enough votes against a given comment, it will not be displayed by default, although a reader can display it through a link or preference. Users who submit articles which other users like and subsequently "vote up" receive "karma", points which a user receives as a reward for submitting interesting articles. reddit also includes several topical sections called subreddits, which focus on specific topics, including programming, science, and politics.