First off, I am very ignorant to this subject. I am only a rising sophomore in physics and have not taken any "modern" physics courses yet(but will in the fall). So I have heard/read that quantum electrodynamics is the more accurate scientific theory to date. Is this theory "complete"? It seems like whenever I look around at areas of study in QFT, I always see QCD and never hear about research still being done in QED. Is electromagnetism fully understood? Again, please understand I don't know much about the topic.