Answer: The Java Runtime Environment (JRE) is part of the Java Development Kit (JDK), a set of programming tools for developing Java applications. According to Oracle, “The JRE is the software environment in which programs compiled for a typical JVM implementation can run. The runtime system includes:
– Code necessary to run Java programs, dynamically link native methods, manage memory, and handle exceptions
– Implementation of the JVM “
So If the JRE is not installed on a computer, Java programs may not be recognized by the operating system and will not run. JRE software is available as both a standalone environment and a Web browser plug-in, which allows Java applets to be run within a Web browser.
According to Wikipedia “The platform includes the execution engine (called a Java Virtual Machine) that allows the same Java program file to run on different operating systems.“