jdk

JDK is an acronym for Java Development Kit. 
It is a software development environment which is used 
to develop Java applications and applets. It physically exists. 
It contains JRE + development tools. JDK is an implementation of any 
one of the below given Java Platforms released 
by Oracle Corporation:
o Standard Edition Java Platform
o Enterprise Edition Java Platform
o Micro Edition Java Platform
Thankful Tuatara