What is a space in hub?
The best way to describe a space is as a virtual entity, which provides a working scope for a user. For example, a space might contain a project in YouTrack, a project in TeamCity, version control repository and a related project in IDE. By granting a user access to a space in HUB, administrator or a project manager automatically provides access for all resources in the space.
Global space is a specific space which incorporates all of the resources added to HUB.
(why do I need it?)
Managing access for everything?