In quantum field theory, particles and fields are considered to be two different aspects of the same underlying physical reality. The electron-positron field, for example, is a quantum field that pervades all of spacetime and is associated with the creation and annihilation of electrons and positrons.
According to quantum field theory, particles are understood as excitations or quanta of their corresponding fields. The field is more fundamental in the sense that it exists independently of whether or not there are particles present. Particles can be created or annihilated through interactions mediated by the field.
In the case of the electron-positron field, it consists of a large number of interacting electrons and positrons. These particles can be created or destroyed through interactions with other particles or fields. The field itself provides a framework for describing the behavior of these particles and their interactions.
So, to summarize, the field is more fundamental than the particle. The field exists independently and particles are considered as localized excitations or quanta of the field. The field creates and annihilates particles through its interactions.