The common cold is a mild viral infection of the upper respiratory tract, most often caused by rhinoviruses, and is one of the most frequent illnesses worldwide. It spreads easily through respiratory droplets, close contact, or contaminated surfaces, particularly in crowded or indoor settings. Typical symptoms include a runny or stuffy nose, sore throat, sneezing, mild cough, congestion, and sometimes low-grade fever or fatigue. Symptoms usually develop gradually and resolve on their own within seven to ten days. There is no specific cure, so treatment focuses on relieving symptoms with rest, fluids, and over-the-counter remedies. Good hand hygiene and avoiding close contact with infected individuals help reduce transmission.