Coronavirus refers to a family of viruses that can infect humans and animals, causing respiratory and sometimes gastrointestinal illnesses ranging from mild to severe. Named for their crown-like (corona) appearance under a microscope, these viruses include strains responsible for the common cold as well as more serious diseases such as SARS (severe acute respiratory syndrome), MERS (Middle East respiratory syndrome), and COVID-19. Coronaviruses spread primarily through respiratory droplets, close contact, and, in some cases, contaminated surfaces. Symptoms vary depending on the specific strain but may include fever, cough, shortness of breath, fatigue, and loss of taste or smell. Prevention and management depend on the virus involved and may include vaccination, hygiene measures, supportive medical care, and public health interventions during outbreaks.