What is Java? A Beginners Guide to Java

Java is one of the most widely used programming languages in the world, powering everything from Android apps to large-scale enterprise banking systems. Created by Sun Microsystems in 1995 and now maintained by Oracle, Java was designed around a simple but powerful idea: "Write Once, Run Anywhere."

Why Java Is Platform-Independent

Unlike languages that compile directly into machine code for one operating system, Java code compiles into an intermediate format called bytecode. This bytecode runs on the Java Virtual Machine (JVM), which exists for Windows, macOS, and Linux — meaning the same Java program can run unchanged across all of them.

• Object-oriented, making large codebases easier to organize and maintain
• Strongly typed, which catches many errors before the program even runs
• Backed by a massive ecosystem of libraries and frameworks like Spring and Hibernate
• Widely used in Android development, web backends, and enterprise software