WildFly is an open-source application server that implements the Java EE (Enterprise Edition) specifications. It is designed to host and manage Java applications, providing a robust environment for developers to build and deploy enterprise-level software. WildFly is known for its lightweight architecture and high performance, making it suitable for both small and large applications. Originally known as JBoss AS, WildFly is maintained by the Red Hat community. It supports various programming models and frameworks, including JavaServer Faces (JSF) and Java Persistence API (JPA). With its modular design, WildFly allows developers to customize their server environment according to specific project needs.