There are lots of websites and applications that won't work unless you have installed Java. Before you run Java programs on your computer, at least you want to install JRE (Java Runtime Environment). When you install JRE, you can run all Java programs and Java applications on your computer.
When you write Java code and try to run it on your computer, computer requires a Java compiler. Because computer cannot read Java code, only can read machine code. The Compiler converts Java code to machine code. However JRE hasn't a compiler, It's come with the Java Development kit (JDK).
When you install Java Development kit (JDK), you can write Java code and run it. Because Java Runtime Environment(JRE) is included Java Development kit (JDK).
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