What is "javac"

n. (context computing English) Java compiler

javac (pronounced "java-see", or often "javack") is the primary Java compiler, included in the Java Development Kit (JDK) from Oracle Corporation.

The compiler accepts source code conforming to the Java language specification (JLS) and produces bytecode conforming to the Java Virtual Machine Specification (JVMS).

javac is itself written in Java. The compiler can also be invoked programmatically.