Azure Front Door is a scalable and secure entry point for the fast delivery of your global web applications.
Front Door uses Microsoft's global 'Anycast' network. When a user visits your app, they hit the nearest Microsoft 'Edge' location. Their request then travels over Microsoft's high-speed private fiber optic cables directly to your .NET backend, bypassing the slow and congested public internet.
Front Door comes with built-in **Web Application Firewall (WAF)** and DDoS protection. It can block malicious requests (SQLi, XSS) right at the edge, before they ever reach your web server. It also handles SSL termination and URL redirection globally.
Q: "ALB vs Front Door: Which one do I need?"
Architect Answer: "Use **Application Gateway (ALB)** if your app is hosted in a single region and you need complex path-based routing within a VNet. Use **Front Door** if your app has a global audience or you need a best-in-class CDN to accelerate your static and dynamic content. For the ultimate enterprise setup, you can even use both: Front Door as the global entrance and Application Gateway as the regional gatekeeper."