Java is a general-purpose, object-oriented programming language(consists of objects and classes) that made for developers to "write once run anywhere". Java is fast, secure, and reliable. It is widely used for developing applications in laptops, data centers, game consoles, scientific supercomputers, cell phones, etc.
It makes the development much faster, easier and fluent.
It is platform-independent. It means that the code compiled in one system can be run on another system without any changes.
It has powerful development tools like Eclipse and Net-Beans that have played a vital role in making Java one of the best programming languages.