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5 What is a Single Page Application SPA

Great one — this is a very common front-end interview question, especially for Angular/React dev roles (perfect for you 😉). ________________________________________ ✅ What is a Single Page Application (SPA)? (Interview Answer) A Single Page Application (SPA) is a web application that loads a single HTML page once and then dynamically updates the content without reloading the entire page when the user navigates or interacts with the app. In short: In an SPA, the page does not reload; only the required data and view are updated dynamically. ________________________________________ 🗣️ One-line Interview Definition A Single Page Application is a web application that loads a single HTML page and updates the UI dynamically without full page reloads. ________________________________________ 🔄 How SPA Works (Explain if Asked) 1. Browser loads one main HTML file (e.g., index.html) 2. JavaScript framework (Angular/React/Vue): o Loads components o Handles routing on the client side 3. When user clicks links: o No full page reload o Only data is fetched from server (via APIs) o UI is updated dynamically ________________________________________ ⚡ Key Features (Interview Points) • ✅ Fast and smooth user experience • ✅ No full page reload on navigation • ✅ Uses client-side routing • ✅ Communicates with backend via APIs (REST/GraphQL) • ✅ Better performance after initial load ________________________________________ 🧠 Example You Can Say Applications like Gmail, Google Drive, and Facebook are examples of Single Page Applications. ________________________________________ 🆚 SPA vs Traditional Multi-Page App (Quick Comparison) • Traditional App: Every click loads a new HTML page from server • SPA: Only data changes, page stays the same ________________________________________ 🎯 In Angular Context (Bonus Line) Angular is used to build SPAs where routing, rendering, and UI updates are handled on the client side without reloading the page. ________________________________________ 🔥 10-Second Interview Answer A Single Page Application is a web app that loads only once and then updates the content dynamically using JavaScript without reloading the entire page, providing a faster and smoother user experience. ________________________________________ If you want, I can also give you advantages & disadvantages of SPA — that’s another favorite interview follow-up 😄