Holiness is the quality of being sacred, pure, or spiritually devoted to God. When something is holy, it's set apart as special and worthy of reverence. A holy book like the Bible or Torah contains teachings people consider divinely inspired. A holy place like a church, mosque, or temple is somewhere people go to worship and feel closer to God.

The word also describes people who live in a way that reflects their deep religious commitment. When we talk about the holiness of a person like Saint Francis of Assisi or Mother Teresa, we mean their lives showed extraordinary devotion, purity, and goodness. They tried to live according to what they believed God wanted, often sacrificing their own comfort to serve others.

Different religions have different ideas about what holiness requires. Some emphasize prayer and meditation, others focus on helping the poor, and still others stress following specific rules and rituals. But the core idea remains the same: holiness means being connected to the divine and living in a way that honors that connection. When religious people pursue holiness, they're trying to align their actions and thoughts with their highest spiritual ideals.