JN.1 is a new emerged sub variant of Covid-19. It was noticed emerged first in Luxemberg and USA in late 2023 and has been spread to China, India, Singapore and France by December 2023. JN.1 has high resistance across receptor binding domain classes 1, 2, and 3 and shows high immune evasion as compared to resistant strains and BA.2.86. According to the World Health Organization, the JN.1 is a variant of interest. At present, the sub variant cases are arising in many countries. The importance of this emerged sub variant is discussed.