Conjunctivitis is an inflammation of the conjunctiva that causes redness and discharge from the eye. There are several types including infectious, allergic, and traumatic conjunctivitis. Signs and symptoms include congestion, swelling, discharge, and photophobia. Treatment involves topical antibiotics, irrigation, anti-inflammatory drops, systemic antibiotics if needed, and lubricating drops. Proper handwashing, isolation of infected individuals, and maintenance of contact lenses can help prevent conjunctivitis.