Field Theory is a framework in physics that describes how fields interact with matter. It provides a mathematical description of physical phenomena, such as electromagnetism and gravity, through the concept of fields, which are functions that assign a value to every point in space and time. The most well-known example is the electromagnetic field, which describes how electric and magnetic forces operate. In Field Theory, particles are seen as excitations or disturbances in these fields. This perspective is crucial in modern physics, particularly in Quantum Field Theory, which combines quantum mechanics and special relativity to explain the behavior of subatomic particles. It has led to significant advancements in our understanding of the universe.