A **baby playpen** (often called a play yard) is a secure, enclosed area designed to provide infants and toddlers with a safe space for independent play and rest. Typically constructed with a sturdy metal or plastic frame and breathable mesh sides, it allows caregivers to keep a close eye on the child while preventing them from wandering into potentially hazardous areas of the home. Modern versions are often lightweight and foldable, making them highly portable for travel or moving between rooms, and many come equipped with padded floors or removable mats to ensure the child remains comfortable and protected while they explore their toys.