Data extraction is something which is finding the relevant data from desire website and retrieves it in other file. I simple words it collect data from any website or webpage and store it in files of any format or it data from website can be use to manipulate to achieve output. Like someone want to get the schedule of movies displayed in different cinemas in an excel file and that data of movies schedule is collect from different website so he can use data extractor to retrieve the schedule of movies from different websites and store it in excel file. For more details: http://bit.ly/1iAor17