mRNA vaccines are a type of vaccine that uses strands of messenger RNA (mRNA) to instruct cells in the body to produce a protein that triggers an immune response. This approach is relatively new and has gained attention for its potential to rapidly develop vaccines against infectious diseases, including the COVID-19 vaccines developed by Pfizer-BioNTech and Moderna. mRNA vaccines have several advantages, such as their ability to be quickly produced in a laboratory setting, their potential for customization to target specific pathogens, and their safety profile compared to traditional vaccines. Research in the field of mRNA vaccines is ongoing, with efforts focused on optimizing the technology, developing vaccines for a wider range of diseases, and exploring potential applications in cancer immunotherapy and other areas.