Web Scraping

Web Scraping is essentially reverse engineering of HTML pages. It can also be an analyzer of pieces of information from a page. Web pages are coded in HTML, which uses a tree-like structure to represent the information.

Scrapers are the programs that "know" how to get the data back from a given HTML page. They work by learning the details of the particular markup and finding if the data are real.

A typical example is a web that copies content from one or more existing websites in order to generate a new site.