How does quantum field theory provide a unified framework for understanding the fundamental forces of nature, incorporating both quantum mechanics and special relativity? Specifically, how do the concepts of quantum fields and particle interactions elucidate phenomena such as the electromagnetic force, weak nuclear force, and strong nuclear force within the Standard Model? Moreover, how do theoretical advancements, such as gauge symmetry and renormalization, contribute to the predictive power and mathematical consistency of quantum field theories? Lastly, what implications does the unification of these forces have for our understanding of the early universe, particle physics, and potential avenues for further theoretical and experimental exploration?