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# Separation of concerns principle

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**Separation of concerns (SoC)** is a design principle for separating a computer program into distinct sections, so that each section addresses a separate concern.
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A **concern** is a set of information that affects the code of a computer program.

A program that embodies SoC well is called a modular program. Modularity, and hence separation of concerns, is achieved by encapsulating information inside a section of code that has a well-defined interface.