Allegory is a form of extended metaphor, in which objects, persons, and actions in a narrative, are equated with the meanings that lie outside the narrative itself. The underlying meaning has moral, social, religious, or political significance, and characters are often personifications of abstract ideas as charity, greed, or envy.
Thus an allegory is a story with two meanings, a literal meaning and a symbolic meaning.

Morality refers to the concept of human ethics which pertains to matters of right and wrong
("good and evil“) on three levels:
1. individual conscience;
2. systems of principles and judgments — sometimes called moral values —shared within a cultural, religious, secular or philosophical community;
3. codes of moral behavior or conduct

The characters in Lord of the Flies have very different ways of approaching problems and are guided by different moral ways of thinking:
Ralph is lead by Common Sense and judges morality on what makes the most sense for the group.
Jack is lead by raw Emotion and makes moral judgments on the whim and will of his every emotion.
Piggy is lead by Intellect and scientifically calculates his moral decisions and judgments.
Simon is lead by the Soul and looks inward for a sense of moral purpose and direction.

The term “social” implies relations and interactions between peoples, and membership or belonging to a group. Social organization is also heavily related political rule.

Ralph represents fair and democratic government . He tries to achieve unity between the boys on the Island and tries to find balance between the opposing forces of the boys.
Jack represents a dictatorship full of one individual’s tyrannical wants. He has the desire to get power and hunt .
He puts his own needs above the needs of other people.
Piggy represents technology and intellectual rule.
Simon represents socialism or humanism , political affiliations aimed at working fairly and honestly for all people.

Ralph represents everyday man who is searching for hope and salvation in a confusing and wicked world.
Jack represents the evil corruption within society. He does not think beyond himself.
Piggy represents the pure intellectual who does not understand spirituality and therefore cannot have faith
In his own salvation.
Simon represents a deep spirituality and faith in humanity.

Lord of the Flies is also a religious allegory of the Garden of Eden.
The island is very much like Eden – a seeming utopia.
The beastie represents the snake (the devil) that tempts
Adam and Eve. That temptation – original sin – is evidence of the innate evil within humans.
The boys exist in a state of frequent nakedness – a state that Adam and Eve shared in the Garden of Eden.
Ralph and Jack are symbolic of Adam and Eve’s sons Cain and Abel.

Psychologist Sigmund
Freud theorized that humans are controlled by:
ID – emotional, instinctual needs and wants
SUPEREGO – moral conscience, tells us right from wrong
EGO – considers reality and balances the needs of the id and superego

– Jack represents the id . This is the part of the unconscious mind that works always to gratify its own impulse. Jack is always working on his instinctual immediate wants and needs.
– Piggy represents the superego . This is the part of the mind that seeks to control the impulsive behavior of the id. Piggy always reminds Ralph and the others of their responsibilities.
– Ralph represents the ego . He is the conscious mind that mediates between the id's demand for pleasure and gratification and the social pressures brought to bear by the superego. Ralph plays a careful balancing game.