Bacterial infections occur when harmful bacteria invade the body, multiply, and cause illness. These microorganisms can enter through cuts, inhalation, or ingestion, leading to various health issues. Common bacterial infections include strep throat, urinary tract infections, and pneumonia. Symptoms often vary depending on the infection but may include fever, pain, and fatigue. Treatment for bacterial infections typically involves antibiotics, which are medications designed to kill or inhibit the growth of bacteria. However, it's important to use antibiotics responsibly to prevent antibiotic resistance, a situation where bacteria evolve and become resistant to treatment, making infections harder to manage.