See the Web Link on your own.

The term Java encompases:

The Java Language

The Java Virtual Machine

The Java Platform

Simple – fits in the space between fully interpreted and fully compiled languages. Clean syntax with a bias towards practicality, productivity and programmer protection.

Object-Oriented – wave of the future, new way of thinking about programs, lots of new concepts and vocabulary.

Network-centric – decentralized computing

Interpreted – bytecodes, JIT.

Robust – protects against uncontrolled access to memory. The O-O model provides a foundation for this also.

Secure – lots of built-in facilities to deal with the distributed computing environment.

Architecture Neutral – "write once, run anywhere".

Portable – because it is architecture neutral, network-centric and no implementation dependent aspects of the language specification. (int is 32-bit no matter what machine Java runs on).

High-performance – several techniques used to get a much performance as possible.

Multithreaded – Java makes writing multithreaded programs easy.

Dynamic Language – extend language through objects, load what you need, when you need it from anywhere in the "network".

A software computer running on a real hardware computer.

Its machine code is the Java Bytecode instruction set.

Core API

Applets, Client Apps, Server Apps, etc…