The term SEO and SEM are pretty famous but confusing at the same time. There is a single alphabet difference in both by writing but a difference of many pages in understanding. Of course, there is a lot more difference in in effectiveness though the purpose remains the same of Business Promotions and generation of Higher Revenues.
SEO the Search Engine Optimization has played a pretty significant role in up lifting the business promotion and developing new and effective strategies for revenue generation. Organic SEO always lead to better results and consequently better promotions. This is all about learning the search engine’s crawling algorithms like of Google.com, MSN, Yahoo and Alta Vista. The basic theme is to promote certain keywords that are highly user or the customer friendly that target your products or the services. Idea remains the same of Advertising as well but the purpose is to get the juice of traffic on any other similar business sites that relates the same philosophy of your business. Not an easy but strategic in applications if you really know the advanced techniques to get this done in a natural way.
SEM, Search Engine Marketing has two aspects one of the SEO and the other of Marketing. You’d rather be afraid what the hell I’m talking about? I’ll say yes.. SEO is in fact a sub component of SEM but it main deal with the Marketing and the direct advertising. In apparently the purpose is to get direct intentions of the customers rather than to get the juice of the traffic on specific site. This may include some nofollow tags as well since the aim is to get the maximum intention and attraction of the customers.
The term will rather be more clear if I say, SEM has two pillars one is the SEO and the other is Internet Advertising.