Java is a programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems' Java platform.
The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. Java applications are typically compiled to bytecode (class file) that can run on any Java Virtual Machine (JVM) regardless of computer architecture.
Java is a general-purpose, concurrent, class-based, object-oriented language that is specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere."
Java is currently one of the most popular programming languages in use, particularly for client-server web applications. "write once, run anywhere" means that any program written in Java can be run on any machine that has a JVM installed in it, in other words Java is not OS reliant, which makes it very portable from smart phones to different OS computers.