A retablo is a devotional painting, especially a small popular or folk art one using iconography derived from traditional Catholic church art. More generally retablo is also the Spanish term for a retable or reredos above an altar, whether a large altarpiece painting or an elaborate wooden structure with sculptures. Typically this includes painting, sculpture, or a combination of the two, and an elaborate framework enclosing it. The Latin etymology of the Spanish word means "board behind". Aside from being found behind the altar, "similar ornamental structures are built and carved over facades and doorways", called overdoors.
Small retablos are devotional or votive paintings, often on rectangular sheets of tin that illustrate holy images such as Christ, the Virgin Mother, or one of the hundreds of saints. Many are ex-votos ("from a vow") that depict the story that led to their commission, usually dangerous or threatening events that occurred, and which the person survived, thanks to the intercession of a sacred person – God, Mary, or a saint. They are made as a way of thanking the sacred person for protection in precarious situations, such as surviving an illness or earthquake. This class of ex-votos often shows the protected humans in a dangerous situation, and the sacred person who protected them, usually with an inscribed explanation of the events, with the date and location. Both devotional and especially ex-voto retablos may be deposited at a shrine as a votive offering, or kept at home.