Tethers are a new type of digital currency, built on the Omni Layer on Bitcoin. Every tether is backed 1-to-1 by traditional currency held in Tether Limited’s reserves. So 1 USD₮ is always equivalent to 1 USD. Bitfinex lets you receive USD₮ from a Bitcoin blockchain address and treat them as a USD deposit. Similarly, you can withdraw funds to a Bitcoin blockchain address as USD₮. Learn more about the benefits of using tethers here.