Quarkus is a Kubernetes-native Java framework designed for building cloud-native applications. It focuses on fast startup times, low memory usage, and rapid response times. Quarkus enables developers to leverage their existing Java skills and libraries while taking advantage of the benefits of containerization and cloud-native deployments. It supports various programming languages and provides a streamlined development experience, making it an excellent choice for developing microservices and serverless applications in the Kubernetes ecosystem. Overall, Quarkus is a powerful framework that simplifies the development process and improves the performance of Java applications in modern cloud environments.