Each sign in the zodiac/horoscope stands for certain qualities/characteristics/personality traits, unique to that sign that separates him from the other signs. Each sign gives an insight into a particular individual's core nature i.e. what he is actually inside.

Aries

21st March-19th April
Ruling Planet Mars
Symbol RAM
Qualities determination, assertiveness, forthrightness, hasty, enterprising, aggression, leadership qualities, intrepidity, impatience, impulsive, selfishness, foolhardy, daredevilry, lacking in foresight, judgment, logic, leaving things half-done

Taurus
20th April-20th May
Qualities passionate, materialistic, dominating, mercurial, practical, hard working, steady, stubborn, obstinate

Gemini

21st May- 21st June
Ruling Planet Mercury
Symbol The Twins
Qualities duality, restlessness, great communication skills, inquisitive, garrulous, flighty, changeable, social butterflies, double-faced, superficial, shallow, insincere, selfish, ambivalent, unfaithful, prone to divorce

Cancer

Qualities nurturing, caring, loving, romantic, sensitive, full of depth, kind

Leo

Qualities requires creative expression, regal, noble, mercurial, likes to live life king-size

Virgo

22nd August-22nd September
Symbol Virgin
Qualities bundle of contradictions, emotionally reserved and detached, innocent, methodical, practical, level-headed, grounded, materialistic, gullible, honest, diligent, meticulous, analytic, extremely hardworking, sensitive, tireless thinkers, perfectionist, fickle minded, classy

Libra
23rd September-23rd October
Ruling Planet Venus
Symbol The Balance
Qualities an incorrigible romantic with an artistic bent of mind, balanced, fond of dressing up, sensual, classy, elegant, impractical, fond of fair play and justice; imaginative, creative, fond of arts and humanities

Scorpio
24th October-22nd November
Ruling Planet Pluto
Symbol The Scorpion
Qualities mysterious, secretive, investigative, calm and self-controlled on the outside; restless, very emotional and susceptible to pain inside; magnetic personality, leadership qualities, independent, strong, intelligent, passionate, intense, popular, jealous, obsessive, dominating

Sagittarius
23rd November-21st December
Ruling Planet Jupiter
Symbol The Archer
Qualities untiring seekers of wisdom, knowledge, greater truth, sublime experiences; adventurous, fond of freedom, liberty; intellectual, liberal, lighthearted, optimistic, sociable, fun-loving, flirtatious, changeable, restless, superficial, irresponsible, careless, fond of gambling

Capricorn
22nd December-20th January
Ruling Planet Saturn
Symbol Goat/Sea-Goat
Qualities introverted, shy, stoical, level-headed, grounded, practical, materialistic, sensual, hardworking, ambitious, deeply loyal, melancholic, dominating, achievers, honest

Aquarius
Qualities fond of experimentation, innovation, and exploration; playful, fond of liberty, superficial, unconventional, insecure, rebellious, uninhibited, free thinkers

Pisces
Qualities sensitive, romantic, deep, romantic, imaginative, impractical, tendency to cheat on partner, cannot tolerate harsh reality or sharp words, unfaithful, profound thinkers, can sacrifice ego

Modes Of Horoscope Signs
Mutable

These signs are changeable and flexible. Pisces, Gemini, Sagittarius, Virgo

Fixed

Dependability is their defining trait. Aquarius, Scorpio, Leo, Taurus

Cardinal

They are forceful by nature. Capricorn, Libra, Cancer, Aries

Elements

There are four elements in horoscope, with three signs out of the 12, belonging to each element.

Water - Pisces, Scorpio, Cancer
Air - Aquarius, Libra, Gemini
Earth - Capricorn, Virgo, Taurus
Fire - Sagittarius, Leo, Aries

Cusps

They form the peripheral fringes of your signs in your horoscope. If you are born in a cusp- i.e. at the junction of 2 consecutive signs, you tend to have the influence of both signs. For e.g. if you are born on MAY 20th you are a Taurus Gemini cusp sign.