Zillow is a real estate marketplace company founded in 2006 by Rich Barton and Lloyd Frink. It operates under the name Zillow Group and comprises four real estate brands: Zillow, Trulia, StreetEasy, and HotPads. The company offers various features, including home valuation tools, mortgage marketplaces, and apps for different platforms. Zillow has expanded its business through acquisitions, such as Postlets, Rentjuice, Hotpads, StreetEasy, and Trulia. It has also introduced new services like Zillow Offers and partnerships with companies like Redfin and Zumper. The company's mission is to help people find and buy or rent their dream homes. For more information, visit Zillow's website at zillow.com.