What is each classes role / responsibilities in a raid?

[Vanessa]

I know that generally speaking, Knights tank, Melee and Casters DPS, and Priests Heal/Buff. But I was wondering specifically, what are some of the responsibilities and jobs of each class in a raid?

For example, I know Rogues do a lot of DPS... but don't they also do some things with Hide and Sneak? Or Wizards, they mostly nuke... but they have stun spells too, right?

I was hoping some of you raiding veterans could explain a little more specifically to me about each class and what they're expected to do in raids?

Thanks!