what is the difference between deer and reindeer

Deer are a family of hoofed mammals that includes many species, such as white-tailed deer, mule deer, elk, moose, and caribou. Reindeer are a specific type of deer that are native to the Arctic and Sub-Arctic regions of the Northern Hemisphere. Reindeer are distinguished from other deer species by their larger size and unique antlers that grow in a characteristic "C" shape. Additionally, reindeer have special adaptations that allow them to survive in harsh Arctic conditions, such as a thick coat of fur, dense body fat, and an efficient metabolism.