What is d procedure of money transfer in paypal?i mean if credit card details are nt exposed to people denhow?

Money goes from paypal account to paypal account. Only paypal has each person's bank info. If you send money, they take it from your bank, then the receiver can choose to transfer that to his/her bank account, or just keep it in paypal and use it from there. Paypal does issue debit cards, and is accepted by many online businesses.