This Unit has provided a broad introduction to the field of Search Engine Optimisation (SEO) and Search Engine Marketing (SEM). It is in no way an exhaustive list of techniques or a technical overview of the field. The target audience is non-technical beginners.
A substantial amount of income is involved specially in SEM. But on the other hand the SEM success is linked to the success of the search engine itself. The field is a very competitive one with a number of players, and specially the big names in IT.