Search engine marketing, (SEM), is a form of Internet marketing that seeks to promote websites by increasing their visibility in search engine result pages (SERPs) through the use of, paid placement, contextual advertising, and paid inclusion.Search engine optimization (SEO) "optimizes" website pages to achieve a higher ranking in search results by selecting specific keywords associated with the website. SEM uses various means of marketing a website to increase its relevance in search engine results.
hi virender.ets, i do agree with Ilona Andrews. he had explained it in details. but in short Search Engine Marketing is the Paid where as Search Engine Optimization in FREE.
Very nice explanation. I like your description of SEM and SEO. Both SEM and SEO are very good way of continuing any online campaign and making money.