search engine optimisation...

If you have a new website and want visitors or, you have an existing site and want more customers you probably need search engine optimisation. Search engine optimisation involves tailoring the contents of the site so it is more relevant to the people searching, encouraging more visitors and thus improving the websites ranking.

search engine marketing...

Search engine marketing involves paid for advertising. The process works by bidding on frequently used search terms; you are charged your bid for each click through. The more you bid the more often your site will appear in the search results.