In this chapter, the three most important auxiliary features introduced by pgModeler will be fully detailed. These features are the model export (or forward engineering), the database import (or reverse engineering), and model­-database diff. However, before starting to describe them it is important to mention that these features will work exclusively on PostgreSQL versions between 10.x and 17.x. Older versions of PostgreSQL (series 9.x) are supported via compatibility mode (enabled in the general settings) but there's no guarantee that these features will produce reliable results, so take extreme care when running the operations described in this chapter in older database versions.