A spell, charm, or incantation is a set of words, spoken or unspoken (prayer). Casting a spell is considered by its user to invoke some magical effect. Historical attestations exist for the use of some variety of incantations in many cultures around the world. Pharmakeia is often the vehicle for binding someone with a spell with and without uttered words. Often binding someone with a spell by the use of spoken word formulas involves the use of evocation.