What is Cookies ?
You can understand cookie from some of the following definitions.

• A small text file of information that certain Web sites attach to a user's hard drive while the user is browsing the Web site. A Cookie can contain information such as user ID, user preferences, archive shopping cart information, etc
• A Cookie is a piece of software which records information about you. It holds this information until such time that the server requests it.
• A cookie is a message given to a web browser (such as Netscape or Explorer) by a web server. The purpose of cookies is to identify web site users/visitors and possibly prepare customized web pages for them

A cookie is a text-only string of information that a website transfers to the cookie file of the browser on your computer's hard disk so that the website can remember who you are.

A cookie will typically contain the name of the domain from which the cookie has come, the "lifetime" of the cookie, and a value, usually a randomly generated unique number. Two types of cookies are used on this website-session cookies, which are temporary cookies that remain in the cookie file of your browser until you leave the site, and persistent cookies, which remain in the cookie file of your browser for much longer (though how long will depend on the lifetime of the specific cookie).

Cookies can help a website to arrange content to match your preferred interests more quickly. Most major websites use cookies. Cookies cannot be used by themselves to identify you.

Types Of Cookie

There are two different types of cookies.

Session cookies - these are temporary and are erased when you close your browser at the end of your surfing session. The next time you visit that particular site it will not recognise you and will treat you as a completely new visitor as there is nothing in your browser to let the site know that you have visited before.

Persistent cookies - these remain on your hard drive until you erase them or they expire. How long a cookie remains on your browser depends on how long the visited website has programmed the cookie to last.

What Information is in Cookie ?

This depends on how a website has set up its cookie feature, but generally the content of a cookie is a randomly generated set of characters. For most purposes a website sending a cookie does not need to know who you are - it just needs to remember that it has seen your browser before.

Some websites do write personal information about you into a cookie, but this is only possible if you have provided them with the information in the first place. If personal information is stored in a cookie it is usually encrypted - coded - so that any third party who has access to the cookie folder of your browser cannot read it.

Some website servers use a combination of methods: on your browser they may create a cookie with unique but anonymous content; or on the server side they may create a file that logs that unique but anonymous content alongside any personal information that you have provided.

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