The Java Runtime Environment spawns a JVM, which is a software layer that runs on top of a computer’s operating system, providing additional services specific to Java.

The JDK is the development platform for building Java applications. Learn about different JDK versions, then install a JDK in your development environment and use it to compile a Java program.

Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.