What is Packages?
A package is a number of documents that you group together for a specific purpose. For example, you might create a package of electrical design drawings for one level of a building you’re working on. This creates a snapshot of the documents at a point in time – they can’t be changed within the package without the package administrator or editor explicitly doing so, and any change is recorded (and the original package document is maintained.)
A package administrator or editor has explicit control over what documents belong in a certain version/revision of a package, and only they can update documents within a package.