Le Groupe SNCF, acteur de la mobilité partagée par tous

By: Sexy

On: November 12, 2024

Tagged: Airport, Bank, Business, Capital, Card, Company, HOTEL, Life, Map, Network, Railway, Restaurant, Shopping, Station, Style, Subway, Transport, Travel

With: 0 Comments

A l’occasion de la Semaine Européenne de la Mobilité, qui a eu lieu du 16 au 22 septembre 2024, découvrez un condensé des actions menées par le Groupe SNCF en faveur d’une mobilité partagée par toutes et tous.

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Spider

Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering).

Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently.

Crawlers consume resources on visited systems and often visit sites unprompted. Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed. Mechanisms exist for public sites not wishing to be crawled to make this known to the crawling agent. For example, including a robots.txt file can request bots to index only parts of a website, or nothing at all.

The number of Internet pages is extremely large; even the largest crawlers fall short of making a complete index. For this reason, search engines struggled to give relevant search results in the early years of the World Wide Web, before 2000. Today, relevant results are given almost instantly.

Crawlers can validate hyperlinks and HTML code. They can also be used for web scraping and data-driven programming.