IHS Screen Digest, a company that provides market analysis on both internet Video on Demand (iVOD) and electronic sell-through (EST) of movies, ranked the iTunes online store the top seller of electronically-delivered movies in the US again in 2010, though new pushes from rivals such as Amazon and Wal-Mart have eaten slightly into Apple's share (Netflix is not counted in the survey since they do not also offer online selling of movies, only streaming rental). All the main movie competitors combined -- Sony's PlayStation Store, Amazon's VOD, Wal-Mart's Vudu service and
