Zemanta is a web service used to extract entities and related images and links out of given text fragment. Wandora's Zemanta extractor is a front end to Zemanta web service converting service feeds to topic maps. In other words, Wandora's Zemanta extractor is used to extract related topics and associations out of given text, an occurrence for example. Wandora's Zemanta extractor starts with a menu option File > Extract > Classification > Zemanta extractor.... Zemanta extractor can be accessed via Wandora's browser extractor also. Zemanta extractor requires a personal API key for the web service. You can register your API key at Zemanta developer site.