Sources trace mRNA tech from basics to bedside: nucleoside-modified mRNA tames innate sensing and boosts translation; engineering across cap/UTRs/poly(A) plus purification optimizes stability and reduces immune noise. Lipid nanoparticles—especially ionizable lipids—are the enabling delivery system. Beyond infectious-disease vaccines, the field is moving toward on-demand/mobile manufacturing and immune-tolerance applications for autoimmunity/allergy, not just immune activation.