Core Java refers to the essential components and foundational features of the Java programming language, including Object-Oriented Programming (OOP), memory management, exception handling, and multithreading. It forms the basis for building Java applications, ensuring code is efficient, maintainable, and scalable. Mastering Core Java is crucial for developers aiming to create robust software solutions and pursue advanced programming techniques. Core Java Training in Chennai at FITA Academy provides the expertise needed to excel in Java development.