BNT 1, or BNT162b1, is a COVID-19 vaccine developed by BioNTech and Pfizer. It is an mRNA vaccine that works by instructing cells to produce a harmless piece of the virus's spike protein, prompting an immune response. This helps the body recognize and fight the actual virus if exposed in the future. The vaccine was part of the first wave of COVID-19 vaccines authorized for emergency use in various countries. Clinical trials demonstrated its effectiveness in preventing COVID-19 infection and reducing the severity of the disease in those who contracted it.