A "lost child" refers to a situation where a minor is separated from their guardians or caregivers, often in public places like parks, malls, or events. This can lead to distress for both the child and the guardians, as the child may feel scared or confused while the guardians experience anxiety over their whereabouts. In many communities, there are protocols in place to help locate lost children quickly. This may involve notifying security personnel, using public announcement systems, or engaging local law enforcement. Organizations like the National Center for Missing & Exploited Children provide resources and guidance on preventing and responding to such situations.