A location in Looker Studio and Looker Studio Pro for content that you own.
Content in Owned by me includes assets that you've created or that have been transferred to your ownership. Unless you share the content directly, other Looker Studio users can't access that content. (Your organization's administrator can always access your content, however.)
Content in Owned by me can't use Looker Studio Pro features. If you are a Looker Studio Pro subscriber, you can move your content to your Sandbox or to a team workspace in order to use Looker Studio Pro features.