Crawler visits a site or a page?

Started by jeyavinoth, 09-18-2017, 07:44:30

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jeyavinothTopic starter

Hi,
      Crawler visits a site or a page?

Regards,
Jeya vinoth


RH-Calvin

#1
A crawler typically visits a website, not just a single page. Crawlers are automated programs that systematically browse the internet to index and gather information from multiple pages within a website.

Crawlers, also known as web spiders or web robots, are computer programs designed to automatically browse the internet and collect information from websites. They are an integral part of search engines' operations, helping to index web pages and gather data for search engine results.

The primary purpose of a crawler is to discover and analyze web content. It starts by visiting a seed URL provided by the search engine or by following hyperlinks from other web pages. Once on a webpage, the crawler extracts information like text, images, and links to other pages. It then follows those links to visit more pages, creating a web of interconnected pages that can be indexed.

Crawlers use algorithms to determine the priority and frequency of page visits. They follow specific rules, including respecting robots.txt files, which can specify what parts of a website are accessible to crawlers. This ensures that crawlers only access the content that website owners want to make available to the public.

Some common uses of crawlers include indexing web pages for search engine databases, monitoring website changes for archiving purposes, and gathering data for research or analysis. However, it's worth noting that not all web crawlers are operated by search engines. There are also specialized crawlers used for tasks like web scraping, data collection, or monitoring website performance.

Overall, crawlers play a crucial role in organizing and providing access to the vast amount of information available on the internet.


fayeseom

A crawler is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index.