Question

define the Quantum Field theory​

Answer 1

in theoretical physics, quantum field theory is a experimental framework that combine classical field theory, special relativity and quantum mechanics but not general relativity's description of gravity

Answer 2

Answer:

It is the mathematical and conceptual frame work for contemporary elementary particle Physics.In a rather informal sense QFT is the extension of Quantum Mechanics(QM),dealing with particles,Over to fields,i.e.Systems with an infinite number of degrees of freedom.