Java is a widely-used programming language that is known for its reliability, portability, and scalability. It is used to build a wide range of software applications, including web applications, mobile apps, desktop applications, and more. Java is an object-oriented language, which means that it is designed to model real-world objects and concepts, making it easier to write and maintain complex software systems. The language was designed to be robust and error-free, with built-in exception-handling mechanisms that make it easier for developers to write bug-free code.