Metadata are chunks of information that are attached to content so that it can be more easily managed, retrieved, and searched for.
The metadata isn’t the content. It exists apart from the content and can add a broader interpretation to it. The meaning and use of the content can become clear with metadata surrounding it.
Metadata can fall in different categories but the most common metadata are management elements such as author, subject, project, customer, creator, creation date, status, etc... However, the HelpServer metadata concept is not meant to constitute complex queries.
HelpServer supports system metadata and user metadata. The system metadata is automatically assigned. Assigning user metadata to content requires human intelligence and cannot be automated. Skill is necessary to create, maintain, and deal with metadata properly. So, carefully consider the definition and usage of metadata when you are working with content. The more metadata you use the harder it will be to maintain it.