Whenever I send bitcoin, I see two addresses as recipients. For example, see this transaction

https://blockchain.info/tx/cbdc112a33125480fa539911c3cc6f4eea5fa7c34b2df895e6de058f204a8794

The address with "1F" is where I sent 10BTC to. What is the "1AvH" address? That address is somehow related to my wallet?