宮城県

By: Sexy

On: October 9, 2025

宮城県（みやぎけん）は、日本の東北地方に位置する県。県庁所在地は仙台市。県内人口は約225万人で（2023年9月1日の推計人口）、東北地方では最も人口が多い県である。人口約110万人の仙台市は東北地方の中心都市で、東北地方で唯一の政令指定都市及び100万都市である。仙台市は東北地方最大の仙台都市圏を形成し、宮城県民の67.9%に当たる154万人が仙台都市圏に居住する。

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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.