Final answer:
Defining extra metadata, rather than tags, on a host system is a best practice because metadata enhances search and filtering capabilities, while tags can't be used for filtering purposes.
Step-by-step explanation:
The best practice is to define extra metadata, rather than tags, on a host system because metadata enhances search and filtering capabilities while tags can't be used for filtering purposes. Metadata provides additional information about a file or resource, such as the author, date created, and keywords, which makes it easier to organize and find specific files or information. On the other hand, tags are usually user-generated labels and do not provide the same level of specificity and functionality as metadata.