SEM (search email marketing) is a combination of seo and PPC.
where is a seo is a process which helps in increasing traffic to a site through various techniques like blogs/articles, search engine submission, directory submission etc. where as PPC is an internet marketing strategy where advertisers pay the publisher(website owners) when the link is clicked. Both seo and PPC is a process of advertising the site. i got a site and i used these process to increase the site traffic. since these process are difficult to do it manually i got seo service from a provider