do you know about the browsers cookies in the browsers?

Cookies usually stores information about you and your computer. Here's a good example. When you visit some of the online shopping sites, you have to login right? Your login information will then be stored on the cookie so that when you load your pages, the site will look for the cookie and logs you in automatically. Some cookies are harmful though and in most cases very discreet (unless you manually review all the cookies). Some record personal information that may be confidential and the website that uses it can use it for malicious purposes. You can erase them. That's ok.

I assume that you are using internet explorer. Cookies are the files that are uploaded to your system by some websites to uniquely identify you.They are used for providing dynamic web pages.These cookies may contain your login information or your prewferences or anything. to delete cookies Go to: internet options-general-browsing history-delete cookies