Almost two years have passed since the coronavirus emerged and a pandemic broke out. The virus has spread across the globe and its consequences can be seen both in terms of human health and life and the health of the economy. Already at the beginning of the pandemic, researchers suggested that there was more than one strain and that mutations would characterise ever new manifestations. Over time, the scientists' words proved to be true. What are the differences between the SARS-CoV-2 variants, what is the reason for the split and which strain is currently present? We answer.