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What is Java and why is it used?

Updated May 6, 2026

Short answer

Java is a high-level, object-oriented, platform-independent programming language used for building enterprise, mobile, and web applications.

Deep explanation

Java works on the principle of 'Write Once, Run Anywhere' using JVM. It is widely used due to its robustness, memory management, and strong ecosystem. It supports OOP principles like inheritance, encapsulation, and polymorphism.

Real-world example

Used in banking systems, Android apps, and large-scale backend services like e-commerce platforms.

Common mistakes

  • Confusing Java with JavaScript
  • assuming it is platform-dependent.

Follow-up questions

  • What is JVM?
  • Is Java compiled or interpreted?

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