Search engine spiders effect without sitemap.

Hey Guys, hope you are optimizing well with your  Webpages. Hold  your search for a while and check this article, as I had promised you to continue my series "Understanding Search engines  - Insights of indexing", I have tried to explain crawling methodology of spiders without Sitemaps. 

So the next question in the series is, What is their methodology  without sitemap?

Hey!  I am back with one more interesting topic for my series "Understanding Search engines  - Insights of indexing"  as I had promised you.

The next question which most of the SEO's ask me is " Can Google crawl our webpage without  sitemap  (xml or html)".