You can load multiple 3D models into a project. Models, objects, and meshes are all 3D geometry that is defined in a computer file.
A model is a 3D object created as the end product of the modelling process. Different methods are used in 3D modelling, including polygonal, NURBS, Sub-D, and metaball techniques.
An object is a generic term describing any item that you can insert into a scene. Models, lights, particle emitters, and cameras are objects.
A mesh is the surface geometry of a 3D model comprising a series of triangle-based representations.