General:
* A small piece of material attached to something for identification or labeling. This could be a label on clothing, a tag on a gift, or a price tag on an item.
* A word or phrase used to categorize or describe something. This is often used in online contexts, such as tagging a post on social media or a photo on a website.
Specific:
* In computer science, a tag is a keyword or label used to identify and categorize data. This is often used in databases, web applications, and other systems.
* In sports, a tag is a physical act of touching a player to indicate they are out. This is common in sports like football, rugby, and baseball.
* In graffiti, a tag is a signature or name written in a stylized way. This is used to identify the artist and mark their territory.
The best definition of "tag" depends on the specific context in which it is used. If you can provide more information about what you are asking about, I can give you a more precise definition.