Evocation is the act of summoning a spirit. The spirit may be an angel, demon, god or goddess, or some other entity. Usually, the purpose of an evocation is to ask the spirit to perform a task. The evocation rituals in the famous magical grimoires, such as
The Goetia, are not only complex, but also require hard-to-obtain magical tools and clothing. While that is certainly one way to summon a spirit, it is not the only way. You do not have to evoke a spirit to physical appearance in order for it to carry out a task for you. A simple evocation ritual can be used to attract a spirit to fulfill a request.
