Is it true that penicillin, an antibiotic, is derived from the Penicillium mold and acts against susceptible bacteria?

Penicillin is a type of antibiotic that is derived from the Penicillium mold. It was discovered by Scottish scientist Alexander Fleming in 1928, when he noticed that a mold growing on a petri dish had created a "zone of inhibition" around it, killing off nearby bacteria. This led to the development of penicillin as a powerful tool in fighting bacterial infections. Penicillin and other antibiotics work by targeting specific components of bacterial cells, such as the cell wall or protein synthesis machinery, while leaving human cells unharmed.