A cookie is a text-only string that can be stored on a user's hard disk. This means they are stored in the memory of your browser for later retrieval. Cookies store data that identifies you, such as your email address.
For a more comprehensive overview of cookies, please refer to The Unofficial Cookie FAQ.
Most important takeaway: You will need to have cookies enabled to use the Library's electronic resources. This page will show you how to do just that.