SEO: Search Engine Optimization.
Search engine optimization includes all the elements needed in your website to obtain a higher ranking in (all) search engines (not just Google).
Crucial is the structure of your website or web application itself. By means of a logical and search engine-friendly structure you can go a long way. You also score better in the rankings with responsive websites.
Apart from the structure, there are of course several systems and services that can provide higher rankings.
Contact Projectweb for more information.