We were a sent a link of our website. We google for info about it and it seem some sort web-crawler (example http://web.archive.org/web/20150915000000*/http://domain-some-name.com
). The link says "This calendar view maps the number of times http://domain-some-name.com) was crawled by the Wayback Machine, not how many times the site was actually updated
What is this and what is it used for?