What is difference between crawling, indexing and caching?

Crawling- Google sends its spiders to your website..
Indexing- Google visited your website and has added you to its database..

Caching- Google took a snapshot of your website when it last visited and stored the data in case your website went down or if there are some any other issues.

Correct, and just because a search engine crawls your site it doesn't mean it will be indexed.

CRAWLING = search engine bot went to website and crawled through the content following each link.

INDEXING = following crawling the search engine bot will decide if your content is worth including or indexing in the search results.

CACHING = storing a version of a page from when it was last crawled... also for easy recall/display search engines can show the cached version (this may not be the latest up to date version of the page it is a stored snapshot that can be displayed just like browser

I agree with @Solah Aana's answer

Hi.. Good Question. Crawling is the process of search engine requesting and successfully downloading a unique URL.
Indexing is the result of successful crawling. I consider a URL to be indexed by Google when a query produces a result, signifying the URL’s presence in the Google index.

Crawling means search engine checked your web page.
Indexing means when search engine shows your web pages in serial order.
Caching means when search engine shows you date and time when it crawled your web page.

Crawling- Google sends its spiders to your website..
Indexing- Google visited your website and has added you to its database..

Caching- Google toook a snapshot of your website when it last visited and stored the data in case your website went down or if there are some any other issues.

Google crawls your site and then indexes what it sees as a cached version of the page.
The page may change in design before they crawl and then re-index the new page hence the term cache is used as almost a caveat to say that the page may've changed since they crawled it.

If your webpages aren't crawled then they can't be indexed. Making sure your site can be crawled by bots is a priority. Set up a Google Webmaster Tools account and then submit a XML sitemap to help Google crawl and index it.

Term Crawling define the very first step of search engine where google bot visit and checked your web page.
After crawling, google work on second step called Indexing. Here search engine managed and added your website in its database.
Another or last step called Caching. It means google show the details of last visited and crawled your website.

Crawling - Google sends its spiders to your website..
Indexing - Google visited your website and has added you to its database..
Caching - Google took a snapshot of your website when it last visited and stored the data in case your website went down or if there are some any other issues.

i dont know byt i think good seo is important for every site or blog
good luck on all online

Crawling+Caching at same time...

Hi Solah,
Which activity firstly performed by Google?

Crawling means search engine checked your web page.
Indexing means when search engine shows your web pages in serial order.
Caching means when search engine shows you date and time when it crawled your web page.