The Omicron variant is a strain of the SARS-CoV-2 virus, which causes COVID-19. First identified in late 2021, it has a high number of mutations in its spike protein, leading to increased transmissibility compared to earlier variants. This means it spreads more easily among people. Health authorities have monitored the Omicron variant closely due to its potential to evade immunity from previous infections or vaccinations. While many cases are mild, it can still lead to severe illness, especially in vulnerable populations. Vaccination remains a key tool in reducing the impact of this variant.