Posted on makeuseof.com
Generally, tag or word clouds visually depict the words used in a given text. Frequently used words may stick out with an increased font size, groups of tags may appear in uniform colors. Additionally, tag clouds can visualize relationships of words.
Tag clouds are much easier to grasp than simple lists, as words can be weighted with the help of font size and color.
We see tag clouds on lots of sites these days. Almost in all cases the purpose of the tag cloud is to give user an easier way to browse the site and at the same time see popular content.
Here are some of my favorite ways tag clouds are used on the web.