Organic traffic, online exploration
What it means is that it should have the right keywords, have relevant and clear content and a well written source code. Basically this will make your site easier for the search engines to read. Aside from the keyword requirements, you should also know that search engines, such as Google constantly change their rules in determining page ranking. The reason they do this is tom make sure that users will find exactly what they are looking for. In other words, the quality of the result of the searches is the major consideration of the search engines.