In Java, the collection is a framework that provides an architecture to store & retrieves a group of objects.it is also known as a single unit of an object.
We can perform operations like insertion, manipulation, deletion, searching & sorting. The framework provides many classes & interfaces.
A collection defined as a group of single units of objects. The framework defined as readymade architecture with a set of classes & interfaces.
Collection framework describes as unified architecture for storing & manipulating a set of objects.
The Hierarchy of the collection framework shown below the image. Java.util package contains the classes & interfaces for the collection framework.
Let understand briefly