Java came into existence in 1991. James Gosling introduced it for Sun Microsystem. It has been in massive use since 1995. Originally, Java designed for consumer electronic devices. Java developed to work on several issues by the other programming languages, which are: 1. Object orientation. 2. Portability 3. Performance 4. Distributed computing. Java has a huge developer base and also a vast collection of libraries (from Sun and other sources). It is object-oriented; that is, Java helps in software development using the notion of objects. Thus software developed using Java is mainly composed of classes and objects. Java helps in the development of diverse applications. A few of the java applications designed to accessed through a web browser. It is robust. Java implements the pointer model, which does not allow access to the actual memory location. Thus overwriting does not take place in the memory. Java is secure. The authentication based on the public-key encryption method. Java supports multithreading. Java is both compiled and interpreted language. It is architecture-neutral because bytecodes run on the Java Virtual Machine and are independent of the platform. They run on any OS.