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Hi,
Crawling: Crawling is, when a search engine sends a bot (aka Search engine spiders) to read or crawl the webpages around the internet database. This crawler reads all webpages carefully and gets back with a calculation and a few tags.
Indexing: Indexing is, when this bot gives all the collected information to the search engines and search engine submits/Index a webpage listing on it, the collected calculations helps search engines to analyze the keywords for the webpage, by which show that in Search listing. Meta tags helps in managing the title and description for that listing
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