Scrapy Rule Class: Follow Parameter and Link Extraction

The 'follow' parameter in the Scrapy Rule class is a boolean value that determines whether the crawler should continue following links extracted by the rule. If no 'follow' parameter is provided, it defaults to 'not callback'. This means that if no callback function is specified, the default behavior is to follow extracted links. This ensures that even without explicitly defining a callback, the crawler will continue exploring the website by following links, effectively traversing the site structure.