Core Java is the part of Java programming language that is used for creating or developing a general-purpose application. To develop general purpose applications. To develop online application and mobile application. Without Core Java no one can develop any advanced java applications. The word Core describes the basic concept of something, and here, the phrase ‘Core Java’ defines the basic Java that covers the basic concept of Java programming language.

While Java is used for development of applets and applications, Core Java is mainly used to design application software for both desktop and server environments. Core Java is the most basic and the purest form of Java which set the foundation for other editions of the programming language.