As an online service, the Cash App works much like PayPal, except it uses Bitcoin as a payment method. As part of the Cash App, you will find an address for your Bitcoin wallet. In other words, it will allow you to buy, sell, send, or receive Bitcoin instantly. As with any crypto wallet app, it is only as secure as the phone that you are using it on. It should be noted that it does not provide you with a recovery seed if your account is lost.