# Concepts

Term	Description	Where to Find
`<organizationId>`	A unique identifier of an Organization in GitBook.	Found in the URL of any space or via the "Copy org ID" button in the organization settings. Example: `https://app.gitbook.com/o/<organizationId/s/<sapceId>`
`<spaceId>`	A unique identifier of a Space in GitBook.	Found in the URL of any space or via the "Copy space ID" button in the upper-right dropdown in a space. Example: `https://app.gitbook.com/o/<organizationId/s/<sapceId>`
`<userId>`	A unique identifier of a User in GitBook.	Retrieved from the "GET Current User" API endpoint or via the "Copy user ID" button from your organization settings.