Real Estate websites like Zillow at http://www.zillow.com/ boasts of a database of around 60 million homes that are based on numerous public records, sales and property values. Zillow offers three valuation techniques for home owners, sellers and purchasers who wish to find out about the worth of their greatest asset, and Zillow provides them with a tool called "Zestimate". Zillow also has a median value tool called "Zindex", and a free tool known as "My Zestimator" that further refines the estimated price of the property. Zillow has a unilateral and extraordinary program for linking. By evaluating their valuation procedure with the tools of this website, real estate professionals can familiarize themselves with their own property listings.