A collection is an object that groups multiple elements into a single unit. Collections are used to store, retrieve, manipulate, and communicate aggregate data.
List
List is an interface that defines a collection of elements in a specific order.
ArrayList
In Java, an ArrayList is a class that is part of the Java collection Framework and can be found in the java.util package. It implements the List interface and provides a resizable array implementation of the List interface
It is used to store a dynamically sized collection of elements. Unlike arrays, which are fixed in size.