シチズン時計株式会社

By: Sexy

On: September 18, 2025

Tagged: Art, Bank, Brand, Business, Card, Collection, Company, Culture, Department, Design, Development, Energy, Engineering, Entertainment, Expose, Fashion, Handjob, Industry, Man, Material, Model, Money, Network, Science, Service, Shopping, Sports, State, Street, Style, System, Technology, Transport, Trend, Truck, Watch, Web, Woman

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シチズン時計株式会社（シチズンとけい、英: Citizen Watch Co., Ltd.）は、東京都西東京市に本社を置く日本の精密・電子機器の製造会社であり、シチズングループの中核を成す企業。関東・甲信越地方を中心として世界各地に拠点を構える多国籍企業である。東証プライム上場。日経平均株価およびJPX日経インデックス400の構成銘柄の一つ。

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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.