Since the end of year 2019, whole world is struggling with the epidemic of the century, the Corona Virus Disease 2019 (COVID-19). Millions of people around the globe have been affected by this contagious virus; many even lost their battle against it. This deadly virus majorly affects our pulmonary system followed by other organs like gastrointestinal tract (GIT), liver, heart, central nervous system (CNS) and other tissues; consequences of which in many cases is death. Our health experts worked day and night to find the weapon that could save human race from this deadly virus and they succeeded in no time by inventing lifesaving vaccines against COVID-19, some of which are now approved by various health authorities around the world. But, for the first time vaccines are made in such short period of time, whereas, in normal course it takes years to invent a vaccine against any virus. Now, this arose many questions on the efficacy and safety of these newly made vaccines; which are the only way, till date, to put a halt in the disastrous path of COVID-19. Thus, worldwide studies are been done to collect the data regarding its efficacy and safety to encourage common people to get vaccinated soon. This article would give the readers a little overview regarding the same.