Norovirus is a highly contagious virus that causes nausea, vomiting, and diarrhea. It can spread through contaminated food or water, person-to-person contact, and touching surfaces with virus particles. While the symptoms are unpleasant, most people recover within a couple days. Though rare, norovirus causes over 200,000 deaths globally each year, primarily in developing countries and vulnerable groups like the elderly. Proper handwashing and disinfecting surfaces can help prevent transmission of the virus.