Theoretical applications refer to the use of abstract concepts and principles to solve real-world problems or to predict outcomes. These applications often stem from fields such as mathematics, physics, or economics, where theories are developed to explain phenomena. By applying these theories, researchers and professionals can create models that help in decision-making, innovation, and understanding complex systems. In various industries, theoretical applications can lead to advancements in technology, healthcare, and environmental science. For instance, quantum mechanics is applied in developing new materials, while game theory informs strategies in business and economics. These applications bridge the gap between theory and practice, enhancing our ability to address challenges.