A "tag" is a label or keyword that helps categorize and organize information. In the digital world, tags are often used on social media platforms like Instagram or Twitter to group similar content. For example, if someone posts a picture of a sunset and uses the tag #sunset, others can easily find that post by searching for that tag. Tags can also be found in blogs and websites, where they help readers discover related articles. By clicking on a tag, users can see all the content associated with it, making it easier to explore topics of interest, such as travel, food, or technology.