Metadata is  structured information about a document file, media files  or other content files. Here is the few Sample metadata define with image

Basic metadata define sharepoint centralizemedia

  1. Owner or Author,
  2. Title or Subject
  3. Additional keywords,
  4. Date of publication,
  5. Security classification,
  6. Roll base access and permissions, few more similarly

Generally Metadata is define for four main Reason:

  1. Specifying content identify

content Identity-metadata-sharepoint-centralizemedia

  1. Effectively manage content

document-management-centralizemedia-metadata

  1. Search and fetching content

content search metadata centralizemedia

  1. Find usability of content

content_Usability-metadata-centralziemedia