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A Web crawler starts with a list of URLs to visit. Those first URLs are called the seeds.As the crawler visits these URLs, by communicating with web servers that respond to those URLs, it identifies all the hyperlinks in the retrieved web pages and adds them to the list of URLs to visit, called the crawl frontier.
Distributed web crawling is a distributed computing technique whereby Internet search engines employ many computers to index the Internet via web crawling.Such systems may allow for users to voluntarily offer their own computing and bandwidth resources towards crawling web pages.
Some of the techniques for indexing, and caching are trade secrets, whereas web crawling is a straightforward process of visiting all sites on a systematic basis. Between visits by the spider , the cached version of the page (some or all the content needed to render it) stored in the search engine working memory is quickly sent to an inquirer.
Search engine scraping is the process of harvesting URLs, descriptions, or other information from search engines.This is a specific form of screen scraping or web scraping dedicated to search engines only.
In addition, ontologies can be automatically updated in the crawling process. Dong et al. [15] introduced such an ontology-learning-based crawler using support vector machine to update the content of ontological concepts when crawling Web Pages. Crawlers are also focused on page properties other than topics.
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Search engine optimization (SEO) is the process of improving the quality and quantity of website traffic to a website or a web page from search engines. [1] [2] SEO targets unpaid search traffic (usually referred to as "organic" results) rather than direct traffic, referral traffic, social media traffic, or paid traffic.
CAD—Computer-Aided Design; CAE—Computer-Aided Engineering; CAID—Computer-Aided Industrial Design; CAI—Computer-Aided Instruction; CAM—Computer-Aided Manufacturing; CAP—Consistency Availability Partition tolerance (theorem) CAPTCHA—Completely Automated Public Turing Test to tell Computers and Humans Apart; CAT—Computer-Aided ...