Eldar: a race of fragile Space Elves, which use technology and finesse over
brute force to ensure the existence of their dying race;
     Alaitoc: The Rangers, they use a host of "Sniper" style tactics along
with a specialized unit called Pathfinders. They have a lot of oput casts called "rangers"
     Beil-Tan: The Swordwind, they Aspect Warriors in their unique and
specialized ways and can be lead by a very specialized Exarch HQ unit called
the Court of the Young King. They are the most agressive of the elder.
     Iyandan: The Ghost Warriors, they use multitudes of Wraithguard &
Wraithlords and can upgrade their Warlocks to Spiritseers. they only have a handful of warriors since they are on the verge of extiction
     Saim-Hann: The Wild Riders, they are the fastest of the Eldar hosts,
utilizing vehicles and Fast Attack choices, the may also be lead by a
specialized Jetbike unit of the Wild Rider Chief and Clansmen. Although this means they have less infantry
     Ulthwe: The Damned, they use Black Guardians and can be lead by a Seer
Council, they may also use "Strike Force" tactics  also  they have very talented phykers there craftworld is near the eye of terror

    
Harliquin Eldar: These Eldar worship the Laughing God and will use their
unique and highly specialized hand-to-hand abilities to guard the Web Ways, they wear diffrent colours and look like clowns

Dark Eldar: a race of nasty Space Elves, which like their brethren use
technology; but also employ combat drugs and focus more on hand-to-hand
combat. They also like to tortue and sacrifice victims

Imperial Guard: the basic human soldier with a multitude of guns, tanks, and
artillery pieces. They are very diverse and can field anything from tank
armies to mob armies.

Lost and the Dammed: all men who have lost faith in the empirium and now
worship the evil Chaos Gods.

Necrons: a race of cold, merciless machines, they use extreme technology and
bionics to overcome all things organic. Of particular note is the fact that
they can often get back up after being shot down.. Even there basic weapon is deadly they worship the ctans god like beings.

Space Orks: a race of thick brutish green creatures, that have a very simple
philosophy that they can never loose because.
     If the run away, they will be back with more boyz.
     If they all die, there are no witnezzes; therefore, the battle never
took place. and,
     If they win, itz bizness az uzual.They have very wacky machines and stuff

Space Marines: a race of Genetically enhanced humans that beleave they ar
the defenders of all humanity, they have a multitude of different chapters
that allows each player to completely customize his army to fit his playing
style. They are GW's baby, or as I call it "The Red Headed Step-Child of
GW", as they have the most options, the best stuff, and still manage to lose
a game every now and then. They are the starters choice

Choas Space Marines: all Space Marines that have lost faith and now worship
the evil Chaos Gods slaanesh, khorne, nurgle of tzneetch

Tau: a race of highly advanced aliens, who use a combination of organic and
machine in order to build the perfect warrior.
     Kroot: a race of barbaric alien mercenaries, most often employed by the
Tau.

Sisters of Battle or Witch Hunters: Much like Space Marines only female, the
may look soft and innocent; but, they are as hard as nails in battle and can
stand up to most anything.

Tyranids: a race of bug-like creatures, who use bio-enhancements to
constantly adapt to their enemies. They are adept at hand-to-hand (or should
I say, Claw-to-hand) fighting and are among the fastest armies in the game. They also have very strange bio-guns

Skaven: a race of evil giant rat-men, which have some weird and wacky machines to pulverize their enemies with. They get stronger as their numbers grow, and their "Bell" can debilitate any War-machines.

Undead: a race of re-born warriors from the grave, they will stop at nothing to convert (through death) all of the living to their undead force.
    Tomb Kings: a race of undead warriors based around an Egyptian theme. They can employ large numbers, powerful magic, and some unique units.
    Vampire Counts: a race of Vampires that use a host of sorcery in which to control a variety of undead creatures such as Skeletons, Wraiths, and Zombies.

Lizardmen: a race of giant lizards and lizard-men theme somewhat around the Aztec or Mayan theme that live in a large rain forest. They have many unique units and very powerful magic as well as a good all around toughness.

Empire: basic mankind set in the "fantasy realm" where might makes right. They are probably the most diverse race having many unit choices and a host of very powerful magic and War-machines.

Bretonians: basic mankind set in the Feudal era where Knights and Chivalry dictate the rules of combat. The power of the heavy horse, lance formation, and general discipline is the key to their success.

Elves: a race of lithe, agile and educated fairy type beings, they can all use powerful ranged weapons, magic and Dragons to aid them in victory;
    Wood Elves: where wild magic and balance in nature are predominant.
    High Elves: where powerful magic and control are predominant.
    Dark Elves: where sinister magic and deception are predominant.

Orcs & Gobllins: a race based on the "fantasy realm" with a host of large brutish green creatures (Orcs) and small weedy weak creatures (Goblins). They rely on strength in numbers and brute force over skill to defeat their enemies. They also have some of the most bizarre special rules in the game, which when the dice go well can be hilarious.

Dwarfs: a race of stocky, stout, short people who use metallurgy to build powerful weapons in order to defeat their enemies. They have a host of War-machines such as guns and cannons, they also have a resilience against magic.

Chaos: a compilation on men and beasts that worship four unholy Gods;
    Beasts of Chaos: the group of mutated animals and men that worship the 4 Chaos Gods, and will stop at nothing to crush anything good.

    Slannesh: the God of luxury, seduction and desires.
    Nurgle: the loathsome God that embodies plague, pestilence and disease.
    Tzeentch: the God of corrupt magic and change.
    Khorne: the God of deceit and bloodlust

space marine legions:

ultramarines

colour: blue armour with yellow on the shoulder bits

primarch: roburte gulliman

basic info: generic space marine force. A bit bland

_________

crimsin fists

colour: darkish blue with crimsin hands

primarch regal dorn

basic info was a part of the imperial fist before they split

_________

dark angels:

colour: completely black or dark green

primarch Lion e'l Jonson

basic info split into 2 bits death wing and ravenwing. the chapter has a shameful secret

________

blood angels

colour: completely red

primarch: sangerious

basic info: mad loyal space marines

_________

imperial fist:

colour: yellow

primarch regal dorn

basic info a proud space marine chapter

________

white scars: 

colour: white with red crest

primarch Jaghatai 
Khan

basic info a fast force with many bikes

___________

black templers

colour:black with white shoulder pads (inside)

primarch Rogal Dorn.

basic info  was part of the imperial fists

____________

Salamanders

emperors children

colour: pink and black

primarch fulgim ( deamon prince now)

basic info fought against the emperor in the black crusade worships slaahnesh

__________

world eaters

colour red and gold

primarch angron (deamon prince)

basic info fought against the emperor in the black crusade worships khorne

________

black legion

colour black

primarch horus

basic info fought against the emperor in the black crusade, worships all the gods

___________

iron worriors

colour silver, yellow and black

primarch pertrobo ( deamon prince)

basic info fought against the emperor in the black crusade, siege specialists

__________

alpha legion

colour greenish black

primarch

basic info fought against the emperor in the black crusade, stelathy legion

_________

word bearers

colour red

primarch

basic info fought against the emperor in the black crusade biulds huge monuments for the 4 gods

__________

death guard

colour greenish

primarch Mortarion (daemon prince)

basic info fought against the emperor in the black crusade now worships nurgle

______________

thousand sons

colour blue and yellow

primarch magnus the red (deamon prince)

basic info fought against the emperor in the black crusade now worships tzeentch