SEM (search engine marketing) is broken down into two groups:
SEO = search engine optimization are the techniques to optimize your website to rank high in the search results. it is broken down into on-page seo (meta tags, h1 tags, etc) and off-page seo (building backlinks to increase page rank)
PPC = pay per click advertising where you pay (usually a search engine) per click on keywords that you bid on to appear as sponsored listings in search results and on other publisher websites
cscgal
The Queen of DaniWeb
19,421 posts since Feb 2002
Reputation Points: 1,474
Solved Threads: 229
So glad I found this, needed clarifying on this subject too.
blackpooldanny
Junior Poster in Training
52 posts since Mar 2009
Reputation Points: 10
Solved Threads: 3
SEO is dead , PPC is dieing , conversation per click is reducing day by day .
ithelp
Nearly a Posting Maven
2,230 posts since May 2006
Reputation Points: 769
Solved Threads: 128