The term "theoretical" refers to concepts, ideas, or principles that are based on theory rather than practical application. It often involves abstract reasoning and models that help explain phenomena. For example, in physics, theoretical frameworks can predict how particles behave, even if those predictions are not always observable in real life. In various fields, such as mathematics and philosophy, theoretical approaches are essential for developing new ideas and understanding complex systems. These theories can guide research and experimentation, providing a foundation for practical applications. However, theoretical knowledge must often be tested and validated through empirical evidence to be fully accepted.