Dynamic rendering is a method of displaying web pages that sends only the parts of the page that have changed since the last time the page was loaded to the user's browser. This makes web pages load faster and reduces data usage, since the user doesn't need to load the entire page each time. Dynamic rendering is achieved by using a technique called "progressive loading". With progressive loading, small chunks of HTML are loaded first, and as those chunks are loaded, they are integrated into an existing DOM (Document Object Model) tree. Once all of the chunks have been loaded, the final DOM is created and rendered in the browser.