Cohesion refers to how strongly related and focused the functions within a module are.

Elaboration:

• High cohesion → Module performs a single, well-defined task (preferred).
• Low cohesion → Module performs multiple unrelated tasks (bad design).
• Improves readability, maintainability, and reusability.

Example:

• High Cohesion: A UserManager class handles user creation, authentication, and updates.
• Low Cohesion: A UserManager class also handles file operations and logging (should be separate).