mvc:annotation-config

The "mvc:annotation-config" tag is a configuration element used in Spring MVC (Model-View-Controller) framework to enable support for annotations in a Spring MVC application.

This tag is added to the Spring MVC configuration file and it tells the framework to scan the application for annotations and configure the corresponding components accordingly.

For example, if the "@Controller" annotation is used on a class in the application, the "mvc:annotation-config" tag will tell the framework to configure that class as a controller and register it as a handler for incoming requests.

In summary, the "mvc:annotation-config" tag is a crucial part of Spring MVC configuration for enabling annotation-based development and simplifying the configuration process.