GWT, short for Google Web Toolkit, is a powerful open-source development toolkit that allows developers to create and maintain high-performance web applications with ease. It utilizes the Java programming language to enable developers to write client-side code that can be compiled into highly optimized JavaScript, making it ideal for building complex and interactive web applications. With its robust set of tools and libraries, GWT empowers developers to create responsive and scalable web applications that can run seamlessly across different browsers and devices. Its intuitive development environment and efficient debugging capabilities make it a popular choice among developers for building modern and dynamic web applications.