What is Java? Java is an object-oriented programming language that was first released in 1995 by Sun Microsystems. It is widely used in software development, mobile applications, game development, web development, and more. Java is considered to be one of the most popular programming languages due to its versatility and scalability. It is a compiled language that runs on any platform with a Java Virtual Machine (JVM). The syntax of the language is similar to C++ and makes it relatively easy to learn for those with some coding experience.