JRE (Java Runtime environment)
JRE provides environment for running/executing programs.
You need to have JRE in your system for >
- class libraries (rt.jar) and
- other supporting libraries (external jars, Ex - ojdbc.jar for JDBC) for executing java program.
In short JRE = JVM + class libraries (rt.jar) + other libraries (if any).
JRE diagram >