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I'm reading Head First Design Patterns book, on page 382 it says:
Composite Patterns is used when you have collection of objects with Whole-Part relationships. and you want to be able to treat those objects uniformly.
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The common sense idea that the sum of the parts will be equal to the whole is not always true, and what is truer still is: The whole is more than the sum of the parts because the whole belongs to a higher plane than the parts.
All healthy relationships share the following three core components: Mutual respect. Mutual trust. Mutual affection.
A system consists of subsystems or components. Components can further be divided into smaller components. Further smaller components can be divided into smaller elements. This is a part-whole hierarchy. Everything around us can be a candidate for part-whole hierarchy.
Well, it's pretty straightforward - any object in a collection is a part of the whole composition and composition as a whole is a collection of parts.
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