All the internet geeks usually use Ctrl+C to Copy and Ctrl+V to paste. But do you ever think how does it happen? Let me tell you when you press Ctrl+C your data is copied in clipboard and when you press Ctrl+V your data pasted from the clipboard.
Copied content can also be accessible by multiple scripts such as JSP,ASP or PHP. Generally we use these scripts in order to create a website. The data copied on the web can easily be transfer to multiple sources through third party like you the Ads running on different websites.
So, be careful while copying any sensitive data like your bank account or credit card info, passwords. It is better, not to visit or open any other web sites while using the browser for bank accounts or while accessing any sensitive information. This hack can be done using the browser Add-ons also. So, please don’t use the browsers with Add-ons to access your sensitive information.