What is the difference between a woodcut and intaglio?

Woodcuts are made from wood and intaglio involves engraving with metal

The main differences between both the intaglio and the relief is that they are basically the opposite of each other. Intaglio is when the ink is pressed into the etched lines while wiping the remaining ink off the surface. Relief printing is when the ink sits on the surface and not in the grooves.

Opposition of two melodic ideas is the  right answer