POI Source is a term used to describe a source of Points of Interest (POI). EDDO stands for Electronic Data Delivery Order, which is a type of POI source that provides data in an electronic format. TARO stands for Targeted Advertising and Research Online, which is another type of POI source that provides data for targeted advertising and research purposes. TRO stands for Traffic Regulation Order, which is a type of POI source that provides data related to traffic regulations.