Describes the root web. The main responcibility is to describe and separate what needs to be deployed on the root web level: - web features - style library provision - anything else Construct your model using AddXXX() or AddHostXXX() syntax. If you have bunch of the 'plain' things to push, then use .AddDefinitionsFromStaticClassType() method. It is a good idea to avoid big model preferring small model per every reasonable operation. The final artifact separation and grouping is tootally up to you and your prpoject needs. Read more here - http://docs.subpointsolutions.com/spmeta2/models/