Netlify is a platform that helps deliver web content quickly, using the JAMstack and intelligent content caching. They implement caching in three major places on the web: the browser, Content Delivery Networks (CDN), and proxies. Netlify uses specific HTTP headers to control caching, such as `max-age` for how long content can be cached and `etag` for versioning files. Their implementation of cache invalidation is designed to support atomic deploys and rollbacks, allowing creators to quickly update their content without worrying about visitors seeing outdated versions. The use of a CDN and HTTP/2 enables fast check-ins with the browser, making this system efficient even when dealing with frequent changes.