CMSs have become the industry standard for companies that want to create and maintain extensive amounts of information (text data, assets like images and video, pdfs, etc.) and make it available for their customers. This results in large sites with a big number of pages. Under that scenario, a primary concern is categorizing that information to improve the author and user experience across the site. That's where defining a site taxonomy becomes crucial. AEM provides the AEM Tags technology to implement one or more content taxonomies on a website. But, before we start talking about Tags and how they are implemented in AEM we need to define the basic concept of taxonomy clearly.