A comprehensive understading of the transpor tproperties of interfaces in high-T_c cuprates has been obtained by considering their microstructure, the possibility of bendifng of the electronic band structure in these materials, and the predominant d_x~2-y~2 - symmetry of the order paramete rin most high-T_c cuprates. These factors are of central importance for the critical current density and the normal state resistivity of grain boundaries and their dependencies on boundary misorientation and on applied magnetic and electrical fields. In addition, some of these factors play an important role for the transport properties of other interfaces involving high-T_c superconductors, such as superconductors-normal metal contacts.
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