A crumb tray is a tray that fits in the bottom of the toaster to catch any crumbs that fall from your bread as its toasting. Whichever stainless steel toaster you choose, it will have a removable crumb tray, either pull-out or spring-loaded. It's important to remove and empty the crumb tray regularly. This will help keep your toaster doing its job effectively and will increase its longevity.