High cohesion is a software engineering concept that refers to how closely all the routines in a class, or all the code in a routine, support a central purpose. Classes that contain strongly related functionalities are described as having high cohesion; the heuristic goal is to make cohesion as high as possible.
In other words, cohesion represents the degree to which a part of a codebase forms a logically single and atomic unit. Therefore, in essence, high cohesion means keeping parts of a codebase that are related to each other in a single place. A general rule of thumb is to make sure that any software has high cohesion.
High cohesion is often paired up with loose coupling.
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