Theoretical concepts are abstract ideas that help explain and understand various phenomena in different fields, such as science, philosophy, and mathematics. They serve as frameworks or models that guide research and inquiry, allowing scholars to predict outcomes and analyze relationships between variables. For example, in physics, the concept of gravity helps explain the attraction between objects with mass. In social sciences, theoretical concepts like sociological theories provide insights into human behavior and societal structures. These concepts are not always directly observable but are essential for developing hypotheses and conducting experiments. They help researchers build a deeper understanding of complex systems and interactions.