Base Material - allows you to select the base material to which the bump/normal effect will be added
Map Type - allows the user to specify wether a bump map or a normal map effect will be added to the base material
Map - specifies the map that is going to be used
Bump Mult - a multiplier for the bump/normal effect
Bump Shadows - when this option is checked V-Ray will consider the bump maps when rendering shadows produced by objects with the bump material applied to them.