What is the difference between indexed and crawling?
 

What is the difference between indexed and crawling:

One common type of indexing in IT is called "search engine indexing." Here, IT tools aggregate and interpret search engine data, again, to streamline data retrieval. This type of indexing is also sometimes called Web indexing.
In the context of SEO, 'crawling' basically refers to a robot which is automatically surfing the web, categorizing and analyzing each site it encounters. There are two main types of such programs in SEO. The first one is the crawlers used by the main search engines, such as Google, Bing or Yandex.