Relativistic quantum field theory (RQFT) combines the principles of quantum mechanics and special relativity to describe the behavior of subatomic particles. It treats particles as excitations in underlying fields, allowing for the creation and annihilation of particles, which is essential for understanding interactions in high-energy physics. RQFT is foundational for the Standard Model of particle physics, which explains the electromagnetic, weak, and strong forces. Key concepts include quantum fields, particles, and interactions, with notable theories like quantum electrodynamics (QED) and quantum chromodynamics (QCD) providing frameworks for specific forces and particles.