A (conceptual) model is a representation of a system or a domain, or of a viewpoint on a system or a domain.

Often a model will be part of an Enterprise Architecture, and its model elements will be included in a Architecture repository. In that case the model is part of an Architecture description.

In an Enterprise Architecture model, each model element will typically occur in two manners:

Check the Conceptual model (Wikipedia) for types and scopes of models and modelling techniques.