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Class objects are used as templates

A collection's is the particular goal types created and executing a collection statements! original Class objects are used as templates to create unique instance objects, which embody both the data and code specific to a data-type.
A collection crapper be based on one or more other classes, called its base class(es). It then inherits the attributes and methods of its base classes. This allows an object model to be successively refined by inheritance. You might have a generic Mailbox collection that provides base access or methods for a mailbox, and subclasses such as Mailbox, Maildir ,Mailbox, Outlook Mailbox that handle different limited mailbox formats.