Consumer demand for central bank digital currency as a means of payment

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On: November 12, 2024

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ECB Research Bulletin by Luca Nocciola and Alejandro Zamora-Pérez

Read more: https://www.ecb.europa.eu/press/resea…

The Research Bulletin features a selection of recent work on policy-relevant topics by ECB economists. Published on a monthly basis, the articles in the Research Bulletin are intended for a general audience.

The views expressed in each article are those of the authors and do not necessarily represent the views of the European Central Bank and the Eurosystem.

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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.