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 ##Adapter
 **Intent:** Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.
 
+![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/adapter/etc/adapter.jpg "Adapter")
+
+**Applicability:** Use the Adapter pattern when
+* you want to use an existing class, and its interface does not match the one you need
+* you want to create a reusable class that cooperates with unrelated or unforeseen classes, that is, classes that don't necessarily have compatible interfaces
+* you need to use several existing subclasses, but it's impractical to adapt their interface by subclassing every one. An object adapter can adapt the interface of its parent class.
+
 ##Bridge
 **Intent:** Decouple an abstraction from its implementationso that the two can vary independently.