Java is a programming language created in the early 1990s by James Gosling at Sun Microsystems. It was initially called Oak but later renamed to Java. The Java platform includes a runtime environment called the Java Virtual Machine (JVM) that executes Java bytecode. Java allows programs to run on any device with a JVM, making it platform independent. Key features of Java include being object-oriented, robust, secure, portable, high performance, and multi-threaded. These features along with automatic memory management make Java very useful for developing applications across devices and platforms.