The Extractor is a tool to capture data from a web pages provided from sequence of the URLs. It processes urls sequentially, load web page and captured data. Despite Agent it can not click and follow links, set input fields, deep crawl. It only loads provided web pages and capture the data.
The source of url can be different. It can be static list of urls, text or Excel files with url, urls from some database, generated urls of local files from folders. Read more about url providers here
The main advantage of the extractor is possibility to capture several page simultaneously.