PayPal announced recently that it has over 100 million active accounts. It is well-designed and secure. It supports AES-256 bit Secure Socket Layer (SSL) encryption. It will also come up green in the URL bar showing the customer that it supports a very high level of encryption.
To confirm the identity of the page, make sure you type "https://www.paypal.com", then click the green bar and confirm it says "PayPal, Inc. Sane Jose, California, US".
PayPal is basically a digital wallet. PayPal believes that customers are giving up traditional payment methods such as cash and checks and turning to a more modern form of payment. In fact, PayPal believes that by 2015 digital currency will be accepted everywhere in the United States.