This document provides an introduction and overview of core Java concepts. It discusses that Java is an object-oriented programming language originally developed by Sun Microsystems (now Oracle) and was designed to be platform independent. It then covers Java's goals of being simple, robust, secure, and able to run on any system with a Java Virtual Machine. The document also discusses Java packages, the JDK, JRE, and JVM. It provides an example of a basic Java program and package structure. Finally, it includes an overview of a bank management system project, describing its requirements, modules, use cases, and ER diagrams.