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Web scraping, web harvesting, or web data extraction is data scraping used for extracting data from websites. Web scraping software may directly access the World Wide Web using the Hypertext Transfer Protocol or a web browser. Wikipedia

Scraping an internet web page includes fetching it and extracting from it. Fetching is the downloading of a web page (which a browser does whilst a person perspectives a web page). Therefore, internet crawling is a major factor of internet scraping, to fetch pages for later processing. Once fetched, extraction can take place. The content material of a web page can be parsed, searched and reformatted, and its statistics copied right into a spreadsheet or loaded right into a database. Web scrapers generally take some thing out of a web page, to utilize it for some other reason someplace else. An instance could be locating and copying names and cellphone numbers, agencies and their URLs, or electronic mail addresses to a list (touch scraping).

As well as contact scraping, web scraping is used as a component of applications used for web indexing, web mining and data mining, online price change monitoring and price comparison, product review scraping (to watch the competition), gathering real estate listings, weather data monitoring, website change detection, research, tracking online presence and reputation, web mashup, and web data integration. Web pages are built using text-based mark-up languages (HTML and XHTML), and frequently contain a wealth of useful data in text form. However, most web pages are designed for human end-users and not for ease of automated use. As a result, specialized tools and software have been developed to facilitate the scraping of web pages.

Newer kinds of net scraping contain tracking statistics feeds from net servers. For example, JSON is usually used as a shipping garage mechanism among the customer and the net server. There are strategies that a few web sites use to save you net scraping, which includes detecting and disallowing bots from crawling (viewing) their pages. In response, there are net scraping structures that rely upon the use of strategies in DOM parsing, laptop imaginative and prescient and herbal language processing to simulate human surfing to permit accumulating net web page content material for offline parsing.