A pacifier, also known as a soother or teether, is a rubber, plastic, or silicone device designed for infants to suck on. It typically has a nipple-shaped part that mimics the shape of a mother's breast, providing comfort and soothing to babies. Pacifiers can help calm fussy infants and may assist in satisfying their natural sucking reflex. Parents often use pacifiers to help babies sleep or to distract them during stressful situations. While pacifiers can be beneficial, it's important to monitor their use, as prolonged reliance may affect dental development. Regular cleaning and replacement are also essential for hygiene.