Conjunctivitis, commonly called pink eye, involves inflammation of the conjunctival membrane lining the inner eyelid and covering the sclera. The condition presents in three primary forms—viral, bacterial, and allergic—each requiring a distinct diagnostic and therapeutic approach. Viral conjunctivitis, often linked to adenovirus, typically resolves within seven to fourteen days with supportive care such as cold compresses and artificial tears. Bacterial cases may warrant topical antibiotic therapy, including fluoroquinolone or aminoglycoside drops, prescribed based on culture sensitivity. Allergic conjunctivitis responds to antihistamine and mast-cell stabilizer regimens that reduce histamine-mediated hyperemia and pruritus.