The capybara (Hydrochoerus hydrochaeris) is a large rodent of the genus Hydrochoerus of which the only other extant member is the lesser capybara (Hydrochoerus isthmius).
JDK is what gives the Java programming language its unique features of portability, security, simplicity, high performance, dynamism among others. With such features, it is no wonder as to why most developers opt to use Java when designing applications.
To explain the difference between JDK and JRE, the best is to read the Oracle documentation and consult the diagram : The Java Runtime Environment (JRE) provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language.