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Interaction Design is a discipline focused on shaping users' experiences with products, systems, and services by creating usable, accessible, and enjoyable interactions between humans and technology. It involves understanding user needs, business goals, and technological constraints to design interfaces that facilitate seamless interaction. In the context of Usability Testing, Interaction Design plays a crucial role in ensuring that software is not only functional but also intuitive and easy to use, thus enhancing overall user satisfaction. By emphasizing on usability principles, it contributes significantly to Software Testing and Software development processes by identifying potential issues early on and integrating user feedback throughout the design process. This results in software that meets user needs, aligns with business objectives, and adheres to high standards of usability and accessibility.