Originally Posted by kajal.pillai22
The crawler visits websites periodically to find the changes in their content and modify their rankings accordingly.
Originally Posted by TM-Ali View Post
I am little bit confuse with your explanation. You have mentioned that Ranker (Search Engine Software) will modify & decide ranking of web page then how crawler can modify their ranking?
The Ranking modified by the crawler is the Page rank (or ranking) decides the relevancy of content on the website.
And the Ranking modified by the ranker is the SERP ranking which consults both the crawler and indexer to show the results for the submitted query.

I think you get the point now.