Why does the crawler crawl more pages than the total number of records it collected?

Why does the crawler crawl more pages than the total number of records it collected?

Some crawlers can collect multiple records from a single page, while others might need to go to 3 pages to get a single record.
For example our Amazon Bestsellers crawler collects 50 records from one page, while our Indeed crawler needs to go through a list of all jobs and then move into each job to get more data about each job.