A more thorough explanation:

Definition: A metatag is a word or phrase that is included in the HTML code of a webpage. It is used to identify the subject of the webpage and to help search engines understand what the page is about. Metatags are hidden from users, but they are used by search engines to help people find the information they are looking for.

For example, if you were creating a webpage about dogs, you might include the metatag "dogs" in the HTML code. This would help search engines understand that your page is about dogs, and it would make it more likely that your page would appear in search results when someone searches for information about dogs.

It is important to note that using someone else's trademark as a metatag without permission can be a violation of their rights. For example, if you were to use the trademark "Nike" as a metatag on your webpage without permission from Nike, you could be infringing on their trademark rights.