Since I do not know much about it, here is what Wikipedia has to say about it:
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Chiromancy or cheiromancy, (Greek cheir, “hand”; manteia, “divination”), is the art of characterization and foretelling the future through the study of the palm, also known as palmistry, palm-reading, chirology or hand analysis. The practice is found all over the world, with numerous cultural variations. Those who practise chiromancy are generally called chiromancers, palmists, palm readers or chirologists.
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Chiromancy consists of the practice of evaluating a person's character or future life by "reading" the palm of that person's hand. Various "lines" ("heart line", "life line", etc.) and "mounts" (or bumps) (chirognomy) , purportedly suggest interpretations by their relative sizes, qualities, and intersections. In some traditions, readers also examine characteristics of the fingers, fingernails, fingerprints and palmar skin patterns (dermatoglyphics), skin texture and color, shape of the palm, and flexibility of the hand.
A reader usually begins by reading the person's 'dominant hand' (the hand he or she writes with or uses the most). In some traditions of palmistry, the other hand is believed to carry past-life or karmic information, as well as hereditary traits.
The basic framework for "Classical" palmistry (the most widely taught and practiced tradition) is rooted in Greek mythology. Each area of the palm and fingers is related to a god or goddess, and the features of that area indicate the nature of the corresponding aspect of the subject. For example, the ring finger is associated with the Greek god Apollo; characteristics of the ring finger are tied to the subject's dealings with art, music, aesthetics, fame, and harmony.
A reader usually begins by reading the person's 'dominant hand' (the hand he or she writes with or uses the most). In some traditions of palmistry, the other hand is believed to carry past-life or karmic information, as well as hereditary traits.
The basic framework for "Classical" palmistry (the most widely taught and practiced tradition) is rooted in Greek mythology. Each area of the palm and fingers is related to a god or goddess, and the features of that area indicate the nature of the corresponding aspect of the subject. For example, the ring finger is associated with the Greek god Apollo; characteristics of the ring finger are tied to the subject's dealings with art, music, aesthetics, fame, and harmony.
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The three lines on almost all hands: the heart line, the head line, and the life line.
The heart line is the first of the major lines examined by a reader. It is found towards the top of the palm, under the fingers. In some traditions, the line is read as starting from the edge of the palm under the little finger and flowing across the palm towards the thumb; in others, it is seen as starting under the fingers and flowing toward the outside edge of the palm. This line is said[Please name specific person or group] to represent matters of the heart, both physical and metaphorical. Those who practice palmistry believe it can indicate emotional stability, romantic perspectives, depression, and stoicism, in addition to various aspects of cardiac health.
The next line identified by palmists is the head line. This line starts at the edge of the palm under the index finger and flows across the palm towards the outside edge. Often, the head line is joined with the life line (see below) at inception. This line is said[Please name specific person or group] to represent the person's mind and the way it works, including learning style, communication style, intellectualism, and thirst for knowledge. It is also believed to indicate a preference for creative or analytical approaches to information (i.e., right brain or left brain).
Finally, readers look at perhaps the most controversial line on the hand, the life line. This line extends from the edge of the palm above the thumb and travels in an arc towards the wrist. This line is believed to represent the person's vitality and vigor, physical health and general well being. The life line is also believed to reflect major life changes, including cataclysmic events, physical injuries, and relocations. Contrary to popular belief, modern palmists generally do not believe that the length of a person's life line is tied to the length of a person's life.
Additional major lines or variations include:
A simian crease, or fusing of the heart and head lines, is believed by practitioners of palmistry to indicate that the person has no distinction between what is desired and what is thought, resulting in an intense nature with a tendency to rush into things.
The fate line runs from the bottom of the palm near the wrist, up through the center of the palm towards the middle finger. This line is believed to be tied to the person's life path, including school and career choices, successes and obstacles. Sometimes this line is thought to reflect circumstances beyond the individual's control, or the person's choices and their consequences.
The heart line is the first of the major lines examined by a reader. It is found towards the top of the palm, under the fingers. In some traditions, the line is read as starting from the edge of the palm under the little finger and flowing across the palm towards the thumb; in others, it is seen as starting under the fingers and flowing toward the outside edge of the palm. This line is said[Please name specific person or group] to represent matters of the heart, both physical and metaphorical. Those who practice palmistry believe it can indicate emotional stability, romantic perspectives, depression, and stoicism, in addition to various aspects of cardiac health.
The next line identified by palmists is the head line. This line starts at the edge of the palm under the index finger and flows across the palm towards the outside edge. Often, the head line is joined with the life line (see below) at inception. This line is said[Please name specific person or group] to represent the person's mind and the way it works, including learning style, communication style, intellectualism, and thirst for knowledge. It is also believed to indicate a preference for creative or analytical approaches to information (i.e., right brain or left brain).
Finally, readers look at perhaps the most controversial line on the hand, the life line. This line extends from the edge of the palm above the thumb and travels in an arc towards the wrist. This line is believed to represent the person's vitality and vigor, physical health and general well being. The life line is also believed to reflect major life changes, including cataclysmic events, physical injuries, and relocations. Contrary to popular belief, modern palmists generally do not believe that the length of a person's life line is tied to the length of a person's life.
Additional major lines or variations include:
A simian crease, or fusing of the heart and head lines, is believed by practitioners of palmistry to indicate that the person has no distinction between what is desired and what is thought, resulting in an intense nature with a tendency to rush into things.
The fate line runs from the bottom of the palm near the wrist, up through the center of the palm towards the middle finger. This line is believed to be tied to the person's life path, including school and career choices, successes and obstacles. Sometimes this line is thought to reflect circumstances beyond the individual's control, or the person's choices and their consequences.

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1: Ligne de vie (Line of life)
2: Ligne de tête (Line of head)
3: Ligne de coeur (Line of heart)
4: Anneau de Vénus (Venus ring)
5: Ligne de Soleil (Line of sun)
6: Ligne de Mercure (Line of mercury)
7: Ligne de chance (Line of luck)
2: Ligne de tête (Line of head)
3: Ligne de coeur (Line of heart)
4: Anneau de Vénus (Venus ring)
5: Ligne de Soleil (Line of sun)
6: Ligne de Mercure (Line of mercury)
7: Ligne de chance (Line of luck)