The concept of dynamic rendering is essential for creating responsive websites that cater to different devices and screen sizes. This technique involves serving content from either the UCD service or a web server, with the advantage of using a web server for higher reliability. Dynamic rendering is beneficial for content that uses JavaScript features not supported by crawlers or indexable, public JavaScript-generated content that changes rapidly. Lightning Web Components (LWC) is a web framework that leverages web components and provides a lightweight solution to render dynamic HTML and CSS on desktop and mobile devices. The connectedCallback method is used to identify the type of screen being rendered and then render the corresponding template. LWC offers built-in libraries and methods for rendering dynamic content, as well as decorators for quick implementations. To implement dynamic pages, developers need to create templates for different devices, code a JavaScript file to determine which template to render based on device detection, and test the website for responsiveness using tools like LT Browser.