All About Cookies
First, and contrary to popular belief, cookies are NOT programs. They don’t do anything at all. Typically, they contain two pieces of information: a site name and unique computer reference. This reference is not used to identify you personally. Cookies are not “viruses” or “trojans”, and they do NOT allow someone to access or take control of your computer.
The site then ’knows’ that you have been there before, and in some cases, tailors what you see on screen to take account of that fact. For instance, it can avoid you being asked to sign up to services that you are already signed up to.
Generally the role of cookies is beneficial, making your interaction with frequently-visited sites smoother - for no extra effort on your part. Without cookies, life online would be much harder.
Almost all web browsers nowadays allow you the option to block cookies. That means you can block all cookies or, with a little more effort, you can pick and choose which ones to accept.
Without cookies browsing becomes much harder - some sites do not work with the cookie-option turned off. However, if it really matters to you, then that option is always available, although we would not recommend it.