indexing is the process of adding webpages into Google search. Depending upon which meta tag you used (index or NO-index), Google will crawl and index your pages. A no-index tag means that that page will not be added into the web search's index.
 
Crawling: When google visit your website for tracking purpose. This process is done by google spider crawler.

Indexing: After crawling, Google starts indexing your website that is called indexing.
 
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