Fleming discovered that a certain mold produced an antibiotic that is called what?

Fleming discovered that a certain mold, specifically Penicillium notatum, produced an antibiotic called penicillin. This groundbreaking discovery in 1928 marked the beginning of modern antibiotics, revolutionizing medicine by providing an effective treatment for bacterial infections. Penicillin has since saved countless lives and paved the way for the development of other antibiotics.