Creating a web application in ASP.NET Core to dynamically display all world flags is a great way to integrate country data with modern web development. The process starts by maintaining a reliable data source, such as a database or JSON file, that contains the country names and the paths or URLs to their corresponding flag image. In ASP.NET Core, you can create a controller to retrieve this data and pass it to the view. Using Razor Pages or an API-based front end (such as Angular or React), the flags can be dynamically displayed in a grid or list format. To improve performance, static flag images can be stored on a CDN, while caching and lazy loading can be applied to handle hundreds of images efficiently. This approach ensures that the application remains scalable, fast, and user-friendly.