Server-Side Rendering (SSR) is when a web page is generated on the server and then sent to the client as a fully formed HTML page. SSR improves SEO and initial load times but can be slower for subsequent interactions.
Client-Side Rendering (CSR) sends a minimal HTML shell to the browser, and the browser uses JavaScript to render the page. CSR allows for faster interactions after the initial load but may feel slower initially.
SSR is ideal for sites focusing on SEO and fast initial load times, while CSR is better for interactivity and dynamic content.
Both SSR and CSR have their advantages, and a mix of both can be used depending on the requirements of the website or application.