COVID-19 is an infectious disease caused by the SARS-CoV-2 virus. The disease was first identified in December 2019 in Wuhan, China, and quickly spread around the world, leading to a global pandemic.

COVID-19 primarily spreads through respiratory droplets when an infected person coughs or sneezes, and it can also be spread by touching contaminated surfaces and then touching one's face. Symptoms can range from mild to severe and may include fever, cough, shortness of breath, fatigue, body aches, and loss of taste or smell.

To prevent the spread of COVID-19, public health authorities recommend measures such as wearing masks, practicing social distancing, avoiding large gatherings, washing hands regularly, and getting vaccinated. Treatments for COVID-19 include antiviral medications, oxygen therapy, and mechanical ventilation for severe cases.

COVID-19 has had a significant impact on society, leading to lockdowns, economic disruptions, and changes in work and school environments. The pandemic has also highlighted health disparities and inequities, particularly among vulnerable populations. Efforts continue to control the spread of the virus and develop effective treatments and vaccines.