[stellajohn]

Crawling is When a search engine sends Search engine spiders to crawl the webpages around the internet database. This crawler reads all webpages carefully and gets back with a calculation and a few tags.

Indexing is when spiders gives all the collected information to the search engines and search engines 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.