Hi,
Can anybody tell me about indexing and crawling? it's important please

Crawling means the search engine robot crawl or fetch the web pages while Indexing means search engine robot crawl the web pages, saved the information and it appear in the search engine.

Crawling means Google is tracking your webpage. Indexing means they've crawled your page and have listed your site in their results.

Indexing is when Google is in the process of adding your website/web pages to its database so that it can be sought after by search engines, website owners can access Google webmasters to check the status. Crawling on the other hand means that search engine bots are looking at your content, it usually precedes indexing and what bots can or cannot crawl can have a huge impact on rankings on the SERP.

Crawling means the search engine robots will only crawl or fetch the web pages or information and will not present it in front of the users while Indexing means search engine robots will crawl the web pages and save the information in their database and when a user seek the particular information that particular page will appear in the search result.

Crawling is the process of an engine requesting and successfully downloading a unique URL
indexing is the result of successful crawling