Bacitracin is an antibiotic that is primarily used to treat bacterial infections. It works by inhibiting the growth of bacteria, making it effective against certain types of skin infections. Bacitracin is often found in topical ointments and is commonly used for minor cuts and scrapes to prevent infection. This antibiotic is derived from the bacterium Bacillus subtilis and is usually applied directly to the skin. While it is effective for localized infections, it is not suitable for treating systemic infections due to its potential toxicity when taken orally or injected.