In general, a collection is an object that holds a group of objects. Each item in a collection is called an element. A Dart collection framework has the following benefits:
It is a set of interfaces that forces developers to adopt some design principles
It can improve the performance of applications significantly
A framework provides a unified interface to store and manipulate the elements of a collection and hide the actual implementation. The Dart implementation of collections is highly optimized for execution in Dart and JavaScript VMs and is far more efficient than what you could create yourself.