With the introduction of Server Side Rendering (SSR) in Gatsby 4, developers can now render web pages on the server instead of the browser, enabling the delivery of real-time data with each page visit. This approach is particularly advantageous for applications requiring frequently updated data, such as weather forecasts, demonstrated through a demo site utilizing the US National Weather Service API for real-time New York City weather updates. SSR offers faster build times compared to Static Site Generation (SSG) by fetching data as needed ('Just In Time'), though it may introduce a slight delay in page rendering. The Gatsby 4 update includes a new function, getServerData, allowing developers to pass data directly to pages using JavaScript, bypassing the need for Gatsby's GraphQL data layer. The demo site leverages TailwindCSS for styling, illustrating how SSR can be effectively implemented to enhance user experience with real-time content, while also inviting developers to explore this feature further and share their creations.