Garbage Collection in Java Explained Simply | How Java Manages Memory Automatically

What is a Garbage Collection?
Garbage Collection in Java is like automatic cleaning. When you create objects in a Java program, they use memory. If some objects are no longer needed, they sit there, taking up space. Garbage Collection is Java’s way of removing these useless objects so that memory can be reused for new objects.

Why Do We Need Garbage Collection?
Imagine your phone's storage. You'll run out of space if you keep saving photos, apps, and videos but never delete the old, unused ones. Garbage Collection works like a cleaning app—it automatically deletes the things you no longer use to free up space.

Real-Life Example
Think of a classroom whiteboard.

When the board is full, the teacher erases (garbage collection) old content that’s no longer needed so they can write new lessons.
If the board isn’t erased, there won’t be space for anything new.