Quantum Field Theory is a theoretical framework that combines the principles of quantum mechanics and special relativity to describe the behavior of particles and fields at a fundamental level.
Classical field theory describes the behavior of particles and fields using classical mechanics, while QFT takes into account quantum effects such as particle-wave duality and uncertainty.
In QFT, a field is a mathematical representation of a physical quantity that exists throughout space and time. Particles are considered as excitations or disturbances in these fields.
QFT is the basis for many theories in modern physics, such as the Standard Model, which describes the fundamental particles and their interactions. It is also used in fields such as cosmology and condensed matter physics.
QFT is a highly mathematical and abstract theory, making it challenging to grasp its concepts and implications. It also involves dealing with complex mathematical equations and requires a solid understanding of quantum mechanics and special relativity.