Linked Project Spaces refer to the connection between an upstream project space and downstream project spaces.
The upstream project space is where the original development work takes place, including the creation of master applications and data models. Once the development work is complete, the finished product is pushed to the downstream project spaces for release.
The downstream project spaces are typically where the end-users or downstream developers access the released version of the content. The content that is pushed from the upstream project space to the downstream project spaces is linked, and is referred to as linked configurations.
This connection between the upstream and downstream project spaces is critical to the development process as it ensures that the downstream project spaces always use the latest and approved versions of the application and data models. It also allows users to sync updates from the upstream project space as needed, keeping them updated with the latest changes and fixes.