XMLBeanFactory is an important tool for Java developers who are constructing Spring MVC applications. It allows developers to work with externalized bean definitions that match a specific configuration. Specifically, it allows projects built on the Spring MVC framework to incorporate application contexts from sources such as XML file configurations. XMLBeanFactory is a powerful tool in the development process, allowing developers to customize their application context by providing factory class definitions and property values at runtime. Moreover, this type of bean definition supports parent-child relationships between beans, helping make the code more layered and organized. As a result, understanding how to use XMLBeanFactory can be invaluable when preparing for a Spring MVC interview and shows that you have an advanced knowledge of the technology.