What is the difference between Indexing and Crawling?

What is the difference between Indexing and Crawling?

 

Your site must be crawled by the search engines robot spider before it is indexed into their search results. Afterward it will be crawled on a regular basis and if there are no changes the search engines will read it as a dead site and your rankings will steadily drop.

 

Crawling is processed to fetch data or content for a website or web page. Indexing is process to manage index data on data base

 

Crawling is the process when robot reads your web page and Indexing is the process of adding your webpage in to the search engines database..