They are simillar Because they involve plate tectonics and they both move in the same direction they are different because sea floor spreading takes place in the ocean and continantal drift takes...
Plate tectonics is the idea that the Earth is made up of plates which move. Therefore the continents drift ever so slightly. The Earth was once made up of one big continent called pangea.
Continental drift is the name of the theory of the earth from around 1925 by Alfred Wegener who suggested it based on the fit of the continental coasts of the Atlantic Ocean, later based on evidence...