Before you start playing, you're going to need to make one very important decision: Will you fight on the side of the Alliance? Or will you do battle under the Horde banner?
For most beginners, it might seem that there isn't much difference - and that is true, to a degree. Practically speaking, the only difference that your faction makes would be the races that are available to you, i.e. the Alliance have Night Elves, Draenei, Humans, Gnomes, and Dwarves whereas the Horde have Undead, Tauren, Orcs, Trolls, and Blood Elves.
Both sides have the same types of classes available to them, so you needn't worry about that at all!
Players more familiar with the Warcraft world will know that there are other story-based differences between the two factions. Originally, the Horde were the 'bad' guys, seeing as they invaded the world and started the wars. However nowadays the Horde are just any other faction, and are neither good nor evil.
Similarly, although the Alliance used to be the traditional 'good' guys, it too is not really stereotyped into that role anymore, and some parts of the Alliance have adopted a decidedly sinister approach on the whole.
Still, if you're interested in the lore aspects of the game, it is interesting to play as both factions
(though you'll have to do so on different servers), just to get a feel of what each faction is going through, and the problems that they face.
One of the only real considerations that you'll have to make when choosing between the Alliance and the Horde is this: Are any of your friends currently playing on any faction?
If you have friends already playing on one faction, and you want to join up with them, then you'll have to select a race from that faction too. Inter-faction grouping and communication is not allowed, and so if you and your friends are on different factions you won't be able to group up and go on adventures as you may desire.
Of course, it could be that you would want to purposely be on the opposite faction from your friends just so that you can engage them in battle!
On a serious note though - now that you know the differences between the factions (which are barely there), you'll see that it is a call that is entirely yours, and so if you want to you could just pick a race and not really even care which faction it is from.
Remember though - you are going to owe your faction your allegiance, so don't take this decision too lightly!
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