A design pattern is a reusable solution to a commonly occurring problem in software design. It is a template or blueprint for how to solve a problem that can be used in many different situations. Design patterns are not specific implementations; they are more like descriptions or templates that you can adapt to solve a particular problem in your code. Common use cases include creational patterns (e.g., Singleton, Factory), structural patterns (e.g., Adapter, Decorator), and behavioral patterns (e.g., Observer, Strategy).
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