Hello,
If you want to buy something online without revealing your information of your credit card or debit card, you should choose PayPal.
Opening a PayPal account is free. Just sign up at https://www.paypal.com, and enter your credit card or debit card detail only once.
And the next time, when you make online purchase, you just need to safely log in your PayPal account, and your payment is processed securely.
Credit card or debit card in some countries, for example, my country, Cambodia, cannot be accepted by some companies like: Click Bank
So, in order to purchase product or service from Click Bank, I need to pay it through my PayPal account. This is another good point of having PayPal account.
To your online success!
Darin
P.S. If you want to open business account, which allows you to accept payment online, click the image below. And enjoy selling your product/service. 
Posts
January 17th, 2008 at 1:29 pm
I found your site on technorati and read a few of your other posts. Keep up the good work. I just added your RSS feed to my Google News Reader. Looking forward to reading more from you.
Aaron Wakling
January 19th, 2008 at 5:04 pm
I totally agree with you on Paypal and enjoyed your article. I definitely didn’t look back after opening my Paypal account a few years back. I look forward to reading more of your posts and appreciate the good information you have posted here.