What is the purpose of cookies? Cookies make the interaction between users and web sites faster and easier. Without cookies, it would be very difficult for a web site to allow a visitor to fill up a shopping cart or to remember the user's preferences or registration details for a future visit.
So cookies, in general, are good but too much can muck certain things you are trying to do on your browser. If you run into a case where that might be the case here is a link to instruction on how to delete them from your browser.