
Goetia, sometimes referred to as "low magic", is the practice of invocation and evocation of demons or daimons, lesser spirits that are used to control and attain powers or knowledge. Some interpret these lesser spirits as evil. However, in ancient Sumerian and Babylonian culture these spirits are simply accepted as natural facts of life and were frequently attached to persons as either neutral or evil. These spirits often times both brought destruction and offered protection, in a role similar to tutelary deities (protectors).
In ancient Greece, the term goetia was originally used as a derogatory term towards fraudulent and low-class magic, in opposition to the term of theurgy which was used to describe the magic conducted by the priests and philosophers.
The Latin word goetia (pronounced /goˈɛtia/) originates from the Greek word for sorcery or witchcraft (γοητεία), or the act of performing sorcery or witchcraft. Goetia is formed from the stem goēt- (γόητ-) of the noun goēs (γόης) meaning sorcerer or wizard.
The term goēs was also used as a derogatory term by higher-class theurgists, as a way to differentiate the practice of high and low magic.
The Ars Goetia is the first grimoire of the Legemeton or Lesser Key of Solomon. Despite the other writings of the Legemeton and Goetia being attributed to King Solomon, the commonly attributed source for the Goetia is Johann Weyer's Pseudomonarchia Daemonum in his De praestigiis daemonum. The Ars Goetia contains the names, orders, offices, and seals of 72 demons, and educates on how to protect oneself when conjuring them.
Each of the demons of the Ars Goetia are said to offer powers and boons for those who conjure them. These gifts include but are not limited to invisibility, wealth, foresight, knowledge, "the destruction of bonds both spiritual and temporal" (in the case of Agares), and the unification of friend and foe (in the case of Raum).