Web crawling is a process of searching and extracting data from a website. Web scraping is the process of taking information from websites, usually without the owner's consent, and repurposing it for other purposes.

Web scraping tools are often used in businesses to collect data from websites or analyze their performance. They can also be used by individuals to quickly collect information on topics they're interested in or need information on.

There are two basic steps involved in web scraping:

  • Collecting data using JavaScript or CSS selectors (a CSS selector is a string that identifies an element on a webpage)
  • Parsing that data using programming languages like Python or Ruby.

There are three types of web scrapers:

  • Web crawlers: These are the most common type of web scraper and they work by following links on a given website and extracting data from the pages that they land on.
  • Scripting spiders: These tools can also be used to extract data from websites but they require programming knowledge and a computer with internet access in order to run them.
  • Web harvesting tools: These tools don't require any programming knowledge and can be used to extract data from hundreds of websites at once.

Web scraping is a popular method of data collection. It is used by many businesses and organizations to collect information from websites. This process can be done manually or with the help of an automated web scraper.

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