Is Exception a Runtime Exception?

Unlike exceptions that are not considered as Runtime Exceptions, Runtime Exceptions are never checked. The Runtime Exception usually shows the programmer's error, rather than the condition a program is expected to deal with. Runtime Exceptions are also used when a condition that can't happen.

What is difference between Exception and runtime Exception?

Exceptions are a good way to handle unexpected events in your application flow. RuntimeException are unchecked by the Compiler but you may prefer to use Exceptions that extend Exception Class to control the behaviour of your api clients as they are required to catch errors for them to compile.

Is runtime Exception caught by Exception?

Catching Exception or Throwable

Catching Exception will catch both checked and runtime exceptions. Runtime exceptions represent problems that are a direct result of a programming problem, and as such shouldn't be caught since it can't be reasonably expected to recover from them or handle them.