Antibiotics are a class of medications used to treat bacterial infections. They work by targeting and killing bacteria or inhibiting their growth, helping the body's immune system to overcome the infection. Antibiotics are prescribed by healthcare professionals and should be taken as directed. Overuse or misuse of antibiotics can lead to antibiotic resistance, a significant public health concern. It's essential to complete the full course of antibiotics as prescribed and not share them with others to ensure their effectiveness in fighting infections.