Difference bwtween indexing and crawling

here crawling and indexing are differnect.


crawling-
Google uses bots ,robots and spiders to crawl every page of the website.
After completion of crawling the crawled data is stored in the search engine database in an index.
Whenever user search for something then search engine come up with best possible match.



indexing-

After completion of Crawling by search engine bots or spiders then indexing starts.
Search engine stores crawled data in their database in an index.
Whenerver user search it come up with best possible match.