Guild Wars 2: What is Condition Damage?

What is condition damage?  Condition damage is a secondary attribute that improves the damage you inflict.
http://wiki.guildwars2.com/wiki/Condition_Damage

Damage is called DPS in World of Warcraft.
http://wiki.guildwars2.com/wiki/Damage

What are conditions?  Here is a list of conditions you can use making your gear.  Apparently you build through both a character tree and through conditions you build into your gear.
http://wiki.guildwars2.com/wiki/Condition

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