A bacterial infection occurs when harmful bacteria enter the body, multiply, and cause illness. These microorganisms can invade various parts of the body, leading to symptoms such as fever, pain, and inflammation. Common types of bacterial infections include strep throat, urinary tract infections, and pneumonia. Treatment typically involves antibiotics, which are medications designed to kill or inhibit the growth of bacteria. However, overuse of antibiotics can lead to antibiotic resistance, making some infections harder to treat. It's important to follow a healthcare provider's guidance when dealing with bacterial infections to ensure effective treatment and recovery.