Question

What is quantum field theory?

What is quantum mechanics?

Answer 1

These are higher standard concepts,only a small portion will be covered even in higher secondary classes(xi and xii).

Basically they are the study about particles in it's smallest forms.

Quantum field theory, body of physical principles combining the elements of quantum mechanics with those of relativityto explain the behaviour of subatomic particles and their interactions via a variety of force fields.

Quantum mechanics is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.