Netlify is highlighting a different feature each day in December, and one of them is Rollbacks, which allows you to instantly revert your site to a previous deployed version if something goes wrong. This can be especially useful for fixing bugs or making design changes that break the site. With Rollbacks, you can click a button to revert to the last stable version, allowing users to continue using the site until it's fixed. Additionally, all previous deployments are available to roll back to, providing an extra layer of safety and control.