Elephant's tails have a few uses. For example elephants can use their tails to communicate with each other; much like a dog, a swishing or wagging tail can signify happiness or excitement.
Baby elephants sometimes hold on to the tail of older animals while they are walking, for guidance and security on long walks. The tail full of hair also works as a flyswatter, to help keep away those annoying and biting flies.
Now I thought I had thick hair o.o