Web.config
Web.config is an XML-based configuration file used in ASP.NET applications to manage settings for web servers, applications, and modules. It allows developers to define configuration options such as connection strings, authentication modes, custom error pages, and compilation settings. This file is automatically processed by the Internet Information Services (IIS) server to apply the specified configurations when the application runs.
Developers should learn Web.config when building or maintaining ASP.NET web applications on the Microsoft stack, as it centralizes configuration management and ensures consistent behavior across different environments. It is essential for tasks like setting up database connections, configuring security policies, and managing application-specific settings without hardcoding values in the codebase.