Cookies are tiny files that your browser stores for a variety of reasons. They can keep you logged into your favorite websites instead of demanding you re-enter your password every time you click on a new page. Here's how we use them.
Often it makes life more convenient to have cookies, but sometimes it doesn't. Maybe your browser is misbehaving, and you want to try clearing the cookies as a troubleshooting step.
To get started clearing your cookies on Chrome (our recommended browser), here are the instructions (there are instructions for other browsers here).