Conjunctivitis, also known as pink eye, is a common infection of the conjunctiva caused by viruses that usually clears within 1-2 weeks without treatment. Symptoms include redness, irritation, swelling of the eyelids, and discharge from the eyes. It spreads easily through contact with infected bodily fluids, so proper hand washing is important to prevent spread, and those with active symptoms should stay home from school or work until discharge has resolved.