For a base class with a number of subclasses, each subclass may have different behavior for a certain action. The stretegy pattern encapsulates each action into a separate class and therefore enabling independent behavior selection at runtime.

• A family of algorithms is defined and they extend a single interface representing the action to be performed.
• The classes performing those actions maintains a reference to a specific stretegy object.
• The behavior could be updated during runtime simply by assigning another action object.
• This pattern decouples the action logic from the classes that perform those actions, reducing complexity and enabling change of behavior.