How do frontend frameworks differ from traditional website structures?

Traditional website structures render complete HTML pages on the server for each request, delivering fully formed content to the browser on every navigation. This approach is simple, SEO-friendly by default, and performs well for content that changes infrequently. However, it produces noticeable page reload delays and limits the interactivity possible without additional JavaScript.

Frontend frameworks shift rendering logic to the browser, building dynamic interfaces from components that update without full page reloads. The trade-off in pure client-side rendering is initial load time and SEO complexity, since search engines must execute JavaScript to index content. Frameworks like Next.js resolve this by supporting server-side rendering (SSR) and static site generation (SSG), combining the performance and SEO benefits of traditional rendering with the interactivity and development efficiency of component-based architecture.