GNU/Linux Red Hat Installing Oracle Java JRE Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install Oracle Java SE JRE in Red Hat GNU/Linux.
And Oracle Java Runtime Environment for Red Hat is software that Java Programs require to run correctly.
So it provides the Class Libraries and other Resources that a specific Java Program needs to run.
Currently, Oracle distribuite the Java Releases only in shape of JDK with the JRE included inside.
GNU/Linux Red Hat Oracle Java JRE Installation Guide