http://www.journaldev.com/2856/java-jvm-memory-model-memory-management-in-java

https://www.youtube.com/watch?v=UnaNQgzw4zY

What is Garbage Collection?

Garbage Collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects. In Java, process of deallocating memory is handled automatically by the garbage collector.