Deploy Previews has been introduced by Netlify, allowing developers to collaborate on website deployments more easily. This feature enables teams to see how changes will look in production without having to deploy them to their existing site. Deploy Previews work by deploying every pull request from a developer's Git repository to a unique URL, which is different from the main site's URL. The preview remains up-to-date as new changes are committed to the same branch, and Netlify's CDN invalidates the cache automatically. This feature is available for all pricing plans, including free sites, and can be integrated with other notifications like Slack's incoming webhooks. Netlify has already seen improvements in their internal development and release processes using this feature, and they hope it will benefit developers as well.