Search Engine Marketing(SEM):
It is about making your brand visible within the search engines to attract new visitors to your site. Its everything that can be done to utilize the technology of search engine to promote a website and increase its traffic, its stickiness. That's why SEO is a subset of SEM.
There are three main steps of SEM in search engine industry:
Natural or Organic Listing: The pages listing results from a search engine query which are displayed in a sequence according to relevance of match between the keyword phrase typed into a search engine and a web page according to a ranking algorithm used by the search engine.
Paid or Sponsored Listing: Sponsored links are paid ads on the results pages of search engines.
Content Network Listing: A content network, such as those at Google, Yahoo! or Microsoft(Bing) Contextual Search, are advertisements served on web pages next to the content containing the keywords being bid on. Content networks are also known as content ads and contextual networks, but are a form of paid inclusion that is more like cost per thousand than cost per click styles of advertisement.
