Also in 2006 XML sitemaps gained universal support from the
search engines.
XML sitemaps allow webmasters to display to the search engines,
every URL on their website that is available for crawling.
An XML sitemap contains not only a list of URLs but a range of
further information, which helped search engines to crawl more
intelligently.
Google also launched two incredibly important tools in
2006:Google Analytics. This free, web-based tool was
so popular at launch that webmasters experienced
downtime and maintenance warnings.Google Webmaster Tools. Now known as the Search
Console, Google Webmaster Tools let webmasters view
crawling errors, see what searches your site showed up
for, and request reinclusion.20 YEARS OF SEO: A BRIEF HISTORY OF SEARCH ENGINE OPTIMIZATION