what above you can see are tag clouds generated at wordle from an abstract on search engine optimization (SEO) .

Tag cloud

A tag cloud is a visual representation of a site's content. The importance of a tags in the website is represented with font size and color, which are listed in alphabetic order. Tag cloud in high-profile were first seen on Flicker, created by Stewart Butterfield .

a tag cloud for this blog generated at wordle.net looks like this.