Its called change. When you receive 1 BTC in a single transaction you have to spend it entirely. Kind of like a 1 BTC bill. It can also be a 0.12345678 btc bill. If you want to spend 0.25 BTC of your 1 BTC bill you get 0.75 BTC as change (no fee for simplicity). Good wallets use a new address to receive the change. The TX you provided however was created by blockchain.info which tends to reuse the same address, thus the change is send "back" to the address the initial bill was recieved on.