Bitcoin payments are easier to make than debit or credit
card purchases, and can be received without a merchant
account. Payments are made from a wallet application,
either on your computer or smartphone, by entering the
recipient's address, the payment amount, and pressing
send. To make it easier to enter a recipient's address, many
wallets can obtain the address by scanning a QR code or
touching two phones together with NFC technology.
thats all are purpose of bitcoin