Clicking the checkbox will cause the site to "remember" your email address and automatically enter it each time you visit. It does this by setting a cookie, which is a tiny bit of code stored on your browser. Many sites use cookies to carry information from one page to the next, such as shopping carts on ecommerce sites. You can also click it off at any time so that the site will no longer remember your email address.

Please note that if you use a different computer to access the site, you'll still need to enter your email!