Pangaea is the name given to the supercontinent that existed approximately 200 million years ago. It was formed as a result of the collision of the Earth's tectonic plates, which brought together several smaller continents to form one giant landmass. Pangaea is believed to have been centered around the present-day Atlantic Ocean, and was surrounded by a single ocean called the Panthalassa.

Evidence for the existence of Pangaea includes the distribution of fossils, ancient mountain ranges, and geological structures. Fossils of the same species have been found on different continents, suggesting that these areas were once connected. Additionally, the shapes of many continents appear to fit together like pieces of a puzzle, adding to the theory of a single supercontinent.

Around 180 million years ago, Pangaea began to break apart due to the movement of the tectonic plates. This process, known as continental drift, resulted in the formation of the continents as we know them today.