"Zillow Group, Inc., or just Zillow, is an American on the internet real estate data source firm that was founded in 2006, and was developed by Rich Barton and Lloyd Frink, former Microsoft executives and also creators of Microsoft spin-off Expedia, Spencer Rascoff, a cofounder of Hotwire.com, David Beitel, Zillow's current chief technology officer, and also Kristin Acker, Zillow's existing senior vice head of state of experience design.

In 2018, Zillow signed a partnership with Century 21 Canada to start detailing Canadian residential properties on the site, noting the initial country outside the United States that Zillow.com supports. Barton is the existing Chief Executive Officer of Zillow, Inc."