what is JDK, JRE, Garbage Collector and Classpath in Java

Java Development Kit (JDK): 
Overview: The JDK is a comprehensive package for Java development. It encompasses essential components like the compiler, Java Runtime Environment (JRE), Java debuggers, documentation, and more. To write, compile, and run Java programs, it's imperative to install the JDK on your computer. In Simpler Terms: Think of the JDK as the toolkit you need to build and run Java applications; it's everything required for Java development. 
Java Runtime Environment (JRE):
Role: JRE, once installed on a computer, facilitates the execution of Java programs. It includes a browser, the JVM, support for applets, and plugins. Without JRE, a computer cannot run Java applications. Breaking it Down: JRE is essentially a set of libraries and additional files that the
JVM uses while your Java program is running.
Garbage Collector: 
Purpose: The Garbage Collector (GC) is a Java feature designed to liberate developers from manual dynamic memory management tasks. It relieves developers from worrying about memory allocation and deallocation, as well as the intricacies of managing memory lifetimes. In Action: The GC automatically handles dynamic memory allocation by performing tasks like allocating and reclaiming memory from the operating system, providing requested memory to the application, and identifying and freeing up unused memory for future use. 
ClassPath: 
Definition: The ClassPath is the path that the Java Runtime Environment (JRE) uses to search for classes and other resource files required by a Java application.