COVID-19 is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The diseases have since spread worldwide, leading to an ongoing pandemic. Symptoms of COVID-19 are variable, yet frequently incorporate fever, hack, exhaustion, breathing challenges, and loss of smell and taste. Side effects start one to fourteen days after openness to the infection. Those people who develop noticeable symptoms, most (81%) develop mild to moderate symptoms (up to mild pneumonia), while (14%) develop severe symptoms (dyspnea, hypoxia, or more than 50% lung involvement on imaging), and (5%) suffer critical symptoms (respiratory failure, shock, or multi-organ dysfunction). At any rate 33% individuals who are tainted with the infection stay asymptomatic and don't create observable indications anytime, yet they actually can spread the illness. A few people keep on encountering a scope of impacts known as long COVID for quite a long time after recuperation, and harm to organs has been noticed. Studies are underway to further investigate the long-term effects of the disease.