A cold is a common illness caused by viruses that infect the upper respiratory system. Symptoms often include a runny nose, sore throat, cough, and sneezing. Colds are usually mild and can last about a week. They are easily spread through the air or by touching surfaces contaminated with the virus. To prevent catching a cold, it's important to wash your hands regularly and avoid close contact with sick people. While there is no cure for a cold, remedies like chicken soup and hot tea can help soothe symptoms. Staying hydrated and resting are also key to feeling better faster.