PACT WITH THE DEVIL

According to traditional Christian belief, the Pact is between a person and Satan or a lesser demon. The person offers his or her soul in exchange for favors. Those favors vary and tend to include Youth, Knowledge, Wealth, Fame, or Power. The persons who make this type of Pact, first, they have to recognize Satan as his or her Master, in exchange for nothing. The person, also promise Satan or a lesser demon, to kill children (it is understood in a sense of a young soul in search of spirituality), or consecrate them to the devil at the moment of birth, or take part in religious ceremonies, or have sexual relationship with demons, and sometimes engender children in an unnatural way.
The Pact can be oral or written.
An oral Pact can be made by means of Invocations, Conjurations, or Rituals with the purpose of attract the demon; once the conjurer feels the presence of the demon spirit, he or she asks for the wanted favor and offers his or her soul in exchange, and no evidence is left of the Pact. In some cases the only evidence left by an oral Pact is an indelible mark left on the person when he or she was touched by the Devil.
A written Pact consists in the same forms of attracting the demon, but includes a written act, usually signed with the conjurer's blood. Forms of these include Contracts or simply signing the name of the person into Satan's Red Book.
The Devil is believed in many religions, myths and cultures to be a supernatural entity that is the personification of evil and the archenemy of God and humankind. The nature of the role varies greatly, ranging from being an opposite force to the Creator God, locked in the material World struggling its survival through the use of the human soul to lure mankind into disbelief and evil as an act of revenge toward God because of his expulsion from heaven.
He was a superior angel whom God elevated to the highest place as a reward for his righteousness. Since angels do not have free will, and have to obey God's command without questioning, he was created different. He had free will and humans were made with free will. Satan saw the humans as a challenging entities. Man as part of the Creation had to show homage and obedience to God by heart.
In the Book of Wisdom, the Devil is represented as the one who brought Death into the World. The 2nd Book of Enoch contains references to a Watcher Angel called Satan-ael, describing him as the Prince who was cast out of heaven and an evil spirit who knew the difference between what was "righteous" and what was "sinful."
In Christianity the Devil is usually named Satan. He is an angel who, along with one-third of the angelic host rebelled against God and were condemned to the Lake of Fire. He hates all humanity, opposing God,  spreading lies and wreaking havoc on the souls of mankind. He is often identified as the crafty serpent who convinced the Woman to eat the forbidden fruit.
In the Bible, the Devil is identified with 'the Dragon" and "the old Serpent" in the Book of Revelation 12:9, 20:2. He has also been identified as "the Prince of this World" in the Gospel of John 12:31, 14:30; and "the Prince of the power of the Air" also called Meririm; and "the Spirit that now worketh in the Children of Disobedience" in the Epistle to the Ephesians 2:2; and "the God of this World" in 2 Cor.4:4. He is also identified as the Dragon in the Book of Revelation, and The Tempter of the Gospels." Sometimes he is called Lucifer, particularly when describing him as an angel before his fall, although the reference in Isaiah 14:12 to Lucifer, or the Son of the Morning, is a reference of him acting in the person of the Babylonian king. Beel-Zebub is originally the name of a Philistine entity, a certain type of spirit named Baal, from Ba'al-Zebub, meaning "Lord of Flies," but it is also used in the New Testament as a synonym for Satan.