In Java, a Collection is an object that contains multiple elements of

same type in a single unit. These multiple elements can be accessed

through one Collection object.

In Java Collections Framework is a library that provides common

architecture for creating, updating and accessing different types of

collections. In Collections framework there are common methods

that are frequently used by developers for working on a Collection

object.

https://www.simplilearn.com/difference-between-collection-and-collections-in-java-article#:~:text=Collection%20is%20used%20to%20represent,operate%20only%20with%20static%20methods.