Spring MVC Interceptor is a concept that can be best explained with the help of an example. Suppose we have a Spring MVC application that contains two methods - one for handling GET requests and other for handling POST requests. Now, suppose we want to add some security checks before allowing any request to access these methods. This is where interceptors come into picture.  A Spring MVC interceptor is a component that can intercept incoming requests and outgoing responses in a Spring MVC application. Interceptors can be used to pre-process requests, post-process responses, or perform general tasks that need to be done before or after request processing.  Interceptors can be chained together; each interceptor in the chain will have an opportunity to process the request or response before it is passed on to the next interceptor in the chain. They are also useful for performing tasks that need to be done before or after request processing, such as logging, authentication, and authorization.  Interceptors can also be used to access resources that are not normally accessible to controllers, such as the HttpServletRequest and HttpSession objects. They are invoked in the order they are configured. Each interceptor in the chain will have an opportunity to process the request or response before it is passed on to the next interceptor in the chain.  If an interceptor throws an exception, the request will be forwarded to the exception handler for that interceptor. If no exception handler is configured for that interceptor, the exception will be propagated up the interceptor chain.  Thus, interceptors provide a powerful and convenient mechanism for adding extra functionality to Spring MVC applications. They can be used for a wide range of tasks, such as security checks, performance monitoring, etc.