Quantum field theory is a theoretical framework in physics that combines classical field theory with quantum mechanics, providing a rigorous description of particles and forces. Within this model, fundamental particles are not considered localized point masses but rather as quantized excitations of pervasive, underlying quantum fields that exist throughout space. Interactions between these particles, such as electromagnetism or the strong nuclear force, are explained by the exchange of force-carrying particles, known as gauge bosons. The construction of the Standard Model of particle physics is largely formulated within this framework, allowing for predictions regarding the fundamental components of matter and the forces governing their behavior.