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Java is a high-level, general-purpose, object-oriented programming language, initially developed by Sun Microsystems and later acquired by Oracle. It is designed to be platform-independent, adhering to the "Write Once, Run Anywhere" (WORA) principle, which means compiled Java code can run on any device supporting the Java Virtual Machine (JVM) without the need for recompilation.

Key characteristics of Java include:

Object-Oriented: Java is built upon the object-oriented programming (OOP) paradigm, utilizing concepts like classes, objects, inheritance, polymorphism, and encapsulation to structure code and promote reusability.

Platform Independent: Through the JVM, Java code is compiled into bytecode, which can then be executed on various operating systems and hardware platforms, ensuring broad compatibility.

High-Level: Java abstracts away low-level machine details, making it easier for human programmers to read, write, and understand code using English-based commands.

Concurrent: Java supports concurrent execution through its threading model, allowing multiple parts of a program to run simultaneously, improving performance and responsiveness.

Strongly Typed: Java is a strongly typed language, requiring explicit declaration of variable types, which helps in catching errors during compilation and improving code reliability.

Secure: Java incorporates various security features, including a robust security model within the JVM, designed to prevent unauthorized access and malicious code execution.

Widely Used: Java is employed in a vast array of applications, including mobile app development (especially Android), enterprise software, web applications, big data processing, and cloud computing.