According to Alfred Wagner, the Continental Drift is when continents were once together into a super continent named Pangaea. All of a sudden, the plates were moving away from each other.
This is what's happening during Continental Drift
From Space, if you look at the continents, it looks like a puzzle piece. You can also tell Pangaea by ancient climates, rock types/structure, and matching fossils. The Earth's outer shell is divided into plates.
Evidence: Mountains, Rocks, Sea Floor, and composition inside the Earth.