Adenoviral conjunctivitis, commonly known as 'pink eye,' is a highly contagious condition caused by adenoviruses, manifesting symptoms such as redness, watery discharge, itching, and swelling of the eyes. The infection typically resolves on its own within 2-4 weeks, and treatment is supportive, focusing on symptom relief and hygiene to prevent spread. Preventative measures include hand hygiene, avoiding close contact with infected individuals, and isolating those infected, especially in communal settings like schools.