Humans, night elves, dwarves, gnomes, draenei, and most recently worgen make up the illustrious Alliance. Proud and noble, courageous and wise, these races work together to preserve order in Azeroth.
The Alliance is driven by honor and tradition. Its rulers are champions of justice, hope, knowledge, and faith.
In a time when chaos and uncertainty reign, the Alliance remains steadfast in its determination to bring light to the darkest corners of the world.
I saw the thread about the official Horde description , here is the Alliance one.