This chapter aims to provide an overview of the overall set-up of transport models and their applications, plus a reflection on transport modeling itself. Main characteristics of transport models are discussed with special attention for the four main components: trip generation, trip distribution, modal split, and network assignment. Both aggregate and disaggregate model approaches are considered. Furthermore, a description is given of practical issues when building and using these models in practice, with special attention for quality control. The main focus is on passenger transport but related models for freight transport models and land use and transport interaction are briefly discussed. The chapter concludes with a reflection on the value and limitations of transport modeling and an overview of new modeling developments.