A fresh crawl is when Google revisits your website’s pages that are already in the index, looking for new pages and updated content along the way.
Google continually updates your sites rankings all the time, but sometimes more aggressively than other times. Be aware that these updates can have both a negative and positive effect on Google rankings for a specific keyword.
When new content is found, “Google”:https://www.rankbydesign.com/google-part1.htm evaluates it in some way and inserts into the search results within hours. New pages can be found almost immediately, though technically they are not yet in Google’s main index.
Sometimes a new page land in a “sandbox”http://en.wikipedia.org/wiki/Sandbox_Effect. This is sort of like a giant holding tank where fresh content waits in line to be analyzed by Google. New sites and domains frequently end up here until the search engine is ready to release the content to be a part of the index.
This includes new “internal links”:https://www.rankbydesign.com/analyze-anchor-text.htm found in existing pages to new content as well. For example, I recently placed a link on my index page to a new article about improving search rankings. Google found the
link and ranked the new page within a day.