This review is devoted to discuss our present understanding of how outflows participate in defining ths various types of morrphologies and featurea observed in Active Galactic Nuclei (AGN). We suggest possÍble interpretations of structurcs observed at radio frequencies (non-thermal continuum radiation) and optical frequencies (continuum and emission line radiation) in terms of results from numerical simulations of outflow propagation and their analytical physical explanation. The conclusion is that we have already reached a good qualitative knowledge oř the several dynamical effects which shape AGN’s structures; the quantitative estimate of their relative importance and conditions of occurrence still awaits a better study of the nonlinear processes in astrophysical conditions and more observational data to determine the values of the physical parameters.