Zillow is an online real estate marketplace that allows users to search for homes, apartments, and other properties for sale or rent. Founded in 2006, it provides detailed information about listings, including photos, prices, and neighborhood data. Users can also find estimates of property values, known as Zestimate, which are calculated using various data points. In addition to property listings, Zillow offers tools for buyers, sellers, and renters, such as mortgage calculators and market trends. The platform also features resources for real estate professionals, helping them connect with potential clients and manage their listings more effectively.