SEO(search engine optimization), SEM(search engine marketing) and social marketing have relation. when website is hosted more traffic is gained when SEO is done and SEO is considered a part of SEM and social marketing is one of the technique of SEO. If proper SEM and SEO is done there will be...
sitemap.xml is way to inform webmaster to make search engine known about which pages are to be crawled along with additional information about the URLs.
keyword stemming is the process of of searching the popular keywords and using its suffix or prefix to make a new keyword which will help to get higher rank.