COVID-19 is a type of coronavirus disease belonging to the family Coronaviridae. The disease is thought to originate from bats and spread to people through an unknown medium in Wuhan, China. Ideally, the condition is spread by inhalation or close interaction with infected droplets with an incubation period between two and fourteen days. Today, thousands of infections and deaths have been caused by the disease. The disease symptoms include fever, cough, sneezing, sore throat, difficulty in breathing, and tiredness. The disease diagnosis starts by gathering samples of the upper and lower respiratory tracts of the infected person. Also, chest X-rays and CT scans are used in the diagnosis. There is no precise treatment for the ailment, which calls for the need to prevent the disease from spreading. Notable prevention strategies are isolation of the infected persons, proper ventilation, hand hygiene, and use of personal protective equipment. This paper provides in-depth information on COVID-19 and it discusses the disease epidemiology, transmission, clinical features, diagnosis, treatment and prevention.