what is pink eye: Pink eye, also known as conjunctivitis, is an eye infection causing inflammation of the conjunctiva, a thin membrane covering the white part of the eye and the inside of the eyelids. It is highly contagious and spreads through direct contact or sharing contaminated objects. Symptoms include redness, itchiness, watery discharge, and crust formation. Treatment options vary depending on the cause, ranging from antibiotics to antiviral or antihistamine medications. Prompt medical attention is crucial to prevent further spread and complications.