Jizō (guardian deity of children); Kṣitigarbha bodhisattva
Refers to the Buddhist deity Jizō, often depicted as a monk and revered as a protector of children, travelers, and the deceased. The term can denote the deity itself or a statue/image thereof.
A Jizō statue is enshrined by the roadside.
Jizō is worshipped as a guardian deity of children.
お地蔵さん is a familiar, affectionate term for Jizō, especially when referring to roadside statues.
From 地蔵 (Jizō, abbreviation of 地蔵菩薩 Jizō Bosatsu, 'Kṣitigarbha Bodhisattva') + honorific suffix 尊 (son, 'revered one').