COVID-19 has become a household term, affecting millions of lives worldwide since its emergence in late 2019. Caused by the SARS-CoV-2 virus, it has led to significant changes in how we live, work, and interact. Understanding it, its signs and symptoms, variants, transmission, prevention, first aid, treatment, vaccination, global response, long-term effects, and post-COVID-19 syndrome can help individuals stay informed and prepared.