Search Engine Optimization or ‘SEO’ refers to the process of improving ‘organic’ traffic received by users finding your site from a search engine results page. Both your web site's markup and content can be optimized specifically to promote placement for a specific set of keywords and phrases.
This is the process of researching and obtaining plausible target phrases. These phrases are then optimized throughout the site ensuring that your site will place high.
As search engines index websites frequently and often adjust algorithms, it is best to repeat the preceding steps on a regular basis to ensure that high placement is retained.