Is it true that Penicillin was discovered by Alexander Fleming?

In 1928, while working at St. Mary's Hospital in London, Fleming discovered penicillin, a type of antibiotic that is derived from the Penicillium mold. This accidental discovery revolutionized medicine and led to the development of numerous other antibiotics that have saved countless lives by treating bacterial infections. Fleming's work on penicillin earned him the Nobel Prize in Physiology or Medicine in 1945.