Java is a widely used object-oriented programming language developed by James Gosling and his team at Sun Microsystems in the 1990s. It is known for its portability, versatility, and security. Some key features of Java include:

1. Platform Independence: Java programs can run on different platforms such as Windows, macOS, and Linux because they run within a virtual environment called the Java Virtual Machine (JVM).

2. Object-Orientation: Java is an object-oriented language, treating everything as an object. This allows for the creation of modular and reusable code blocks.

3. Robustness and Security: Features like garbage collection (automatic memory management), exception handling, and strong typing enhance the stability of Java programs. Security is ensured through restrictions on code execution.

4. Widespread Use: Java finds application in various domains, from enterprise software development and web applications (through Java Enterprise Edition) to mobile devices (many Android apps are written in Java) and embedded systems.

5. Rich Standard Libraries: The Java Standard Library offers a wide range of functionalities for various purposes, including data structures, networking capabilities, graphics, and more.

Java is commonly used for developing applications, websites, mobile apps, and large-scale systems. Due to its portability, security, and versatility, it remains a popular choice among developers worldwide.