Folk saints are dead people or other spiritually powerful entities (such as indigenous spirits) venerated as saints, but not officially canonized. Since they are saints of the "folk", or the populus, they are also called popular saints. Like officially recognized saints, folk saints are considered intercessors with God, but many are also understood to act directly in the lives of their devotees.
Frequently, their actions in life as well as in death distinguish folk saints from their canonized counterparts: official doctrine would consider many of them sinners and false idols. Their ranks are filled by folk healers, indigenous spirits, and folk heroes. Folk saints occur throughout the Catholic world, and they are especially popular in Latin America, where most have small followings; a few are celebrated at the national or even international level.
In the pre-Christian Abrahamic tradition, the prophets and holy people who were honored with shrines were identified by popular acclaim rather than official designation. In fact, the Islamic counterparts of the Christian saints, associated most closely with Sufism, are still identified this way. Early Christians followed in the same tradition when they visited the shrines of martyrs to ask for intercession with God.
Thus, there is a long tradition for the veneration of unofficial saints, and modern folk saints continue to reach popularity in much the same way as ever. Tales of miracles or good works performed during the person's life are spread by word of mouth, and, according to anthropologist Octavio Ignacio Romano, "if exceptional fame is achieved, it may happen that after his [or her] death the same cycle of stories told during life will continue to be repeated." Popularity is likely to increase if new miracles continue to be reported after death. Hispanic studies professor Frank Graziano explains:
[M]any folk devotions begin through the clouding of the distinction between praying for and praying to a recently deceased person.