Reddit is a prominent American social news aggregation and forum platform where users, known as "redditors," submit content like links and posts that are then voted up or down by the community and organized into themed "subreddits." Founded in 2005 by Steve Huffman, Alexis Ohanian, and Aaron Swartz, it has since grown into the world's seventh-most-visited website as of February 2025, with a substantial user base primarily in the United States.

After its acquisition by Condé Nast in October 2006 and subsequent establishment as an independent subsidiary, Reddit made its stock market debut on March 21, 2024, and currently boasts a market capitalization of US$10 billion. While praised for fostering diverse niche communities and its role in political activism, the platform also faces criticism for its potential to spread misinformation and encourage online echo chambers due to its unique voting system.