Version skew occurs when a web application running on a browser expects one version of the code, but the server provides another, leading to potential disruptions in user experience. Netlify addresses this issue by introducing skew protection, which pins each session to a specific deploy version, ensuring that the client-server contract remains intact even after updates. This approach maintains both old and new deploys, directing traffic based on the version requested by the client, thus preventing errors like 404s from outdated file requests. Skew protection is automatically enabled for Astro sites using the Netlify Adapter from version 5.15.0, and Next.js users can opt-in easily, with Netlify committed to supporting any framework through their Frameworks API. This feature is available for free, and comprehensive documentation is provided to help users get started with their preferred framework.