Ok, it is clear for us the Gustavo Acevedo-Hernández´s answer, but Reading some publicactions many people has doubts about the three concepts. Ex: "Modules can be understood as a separated substructure of a network or pathway, e.g. the complex of fatty acid synthetase subunits may serve as an example of a module of the fatty acid biosynthesis pathway and the protein complex is a module of a protein interaction network". In Tornow S, Mewes HW. Functional modules by relating protein interaction networks and gene expression. Nucleic Acids Research. 2003;31(21):6283-6289. doi:10.1093/nar/gkg838.