The DRY (Don't Repeat Yourself) principle is a fundamental principle in software development that promotes the elimination of redundancy in code to improve maintainability, readability and efficiency. This principle, described by Andy Hunt and Dave Thomas, suggests that every piece of knowledge in a system should have a unique representation. DRY is applied across various programming paradigms, such as object-oriented programming, functional programming and modular programming, each with its own strategies for achieving code reuse. However, applying too much DRY can lead to excessive abstractions and tightly coupled code, making it difficult to understand and maintain. Therefore, it is crucial to find a balance between DRY and code simplicity.

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