How to explain Java's cross-platform nature and why it is considered a multi-platform technology?

Java is considered a cross-platform (multiplatform) technology because Java programs are not compiled into machine code specific to a particular operating system, but into bytecode, which is executed on the Java Virtual Machine (JVM). JVM exists for different operating systems and hardware platforms, so the same bytecode can run on Windows, Linux, macOS, and others without changes.

For example: if you write a program in Java and compile it into bytecode, this .class file can be run on any platform that has a JVM, without recompilation.

Thus, Java provides code portability and platform independence, which makes it cross-platform.