Methicillin-resistant Staphylococcus aureus, commonly known as MRSA, is a type of bacteria that has developed resistance to many antibiotics, including methicillin. This makes infections caused by MRSA more difficult to treat compared to other strains of Staphylococcus aureus. MRSA can lead to various infections, ranging from skin infections to more severe conditions like pneumonia or bloodstream infections. MRSA is often spread through direct contact with an infected person or contaminated surfaces. It is commonly found in places like hospitals and nursing homes, where people may have weakened immune systems. Good hygiene practices, such as regular handwashing, can help prevent the spread of MRSA.