Mule is a popular lightweight, open-source integration framework that allows developers to quickly and easily integrate applications, services, and APIs across their existing IT infrastructure. With Mule, developers can create scalable and robust application networks that can seamlessly connect different systems and data sources, automate business processes, and accelerate digital transformation efforts. Mule also provides a range of tools and middleware technologies that help with error handling, message routing, data transformation, and security, making it one of the most flexible and versatile integration platforms available today.