Netlify will highlight a different feature each day in December, with the goal of helping users unlock their creative potential and deploy their registered domains. When deploying updates to a site on Netlify, users receive a unique URL for that specific deployment, which also updates the production URL being served to visitors. This allows users to track historic versions of their site and monitor changes over time, making it an essential tool for QA teams. Additionally, this feature is useful when working with clients who require a specific version of the site for review while development continues. Users can find permalinks for every deployed version by visiting the Deploys page in the Netlify Admin app, which includes links to each successful build. This feature provides a way for users to share specific versions of their site with others while keeping updates separate. The unique URLs generated by Netlify make it easy to keep track of historic builds and monitor changes over time.