Tags are commonly defined as commands inserted in a certain document. These specify the manner on how a specific document or a portion of it should be layouted or formatted. Meanwhile, tag clouds are visual depiction of the tags generated by users. Typically, tag clouds are the different words used in a certain website in order to describe the overall content of the website. Tag clouds may also listed alphabetically. The more important a certain word or tag is the bigger its size. There are also tag clouds that have hyperlinks leading to certain collection of related tags. The Web 2.0 has also tag clouds.
There are Web 2.0 tag clouds available on different websites. The words included to the Web tag cloud are blogs, wikis, folksonomy, participation, usability, joy of use, social software, recommendation, simplicity, and AJAX. Other words or tags included are design, CSS, affiliation, economy, the long tail, web standards, standardization, microformats, datadriven, and remixability. Some tags in the tag cloud are OpenAPIs, mobility, convergence, video, and audio.
Other than tag clouds, there are also data clouds and text clouds. The data cloud is a visual representation to display different data. It uses the font size or font color in order to indicate the specific numerical value of data. Meanwhile, the text cloud is a visualization of different word frequency. The more that a certain word is used in the website, the bigger it will appear on the image. These two can also be used instead of the Web 2.0 tag clouds.