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
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?
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.