It would be easy to speak of bards as the people who love being at the center of the attention, singing a great drinking song after a long day of fighting, and that is the most obvious role bards play. However, their role is not quite as obvious as it would seem.
Bards are the heart of a community. They rally spirits that are down, they sober those who would have passions run away from them, and they tell the story of those who are living and those who have departed. A skilled bard supports the town in times of crisis, on the battlefield or off, helps lead discussions on major or minor decisions, and also has no problem making a coin or two in the process.
Where do they get their power?
Bardic power comes from the power of the voice. While runic mages understand that symbols have power, bards understand the power that words and the music of a sentient creature can have on others. Bards use their voice to manipulate the emotions of those who listen.
Bardic magic is perhaps the closest a caster can come to relying solely on personal capacity. In order to master bardic energy one must have a fierce sense of passion and empathy. While you may never have honest control over your emotions, you do possess the ability to remember moments in your life that have brought on a range of emotions. Harnessing these emotions and learning to direct them outward from you, in a controlled manor, is the essence of bardic magic. Think for a moment on a time where you felt warm, safe, and comfortable. Do you remember where you were the last time you felt this way? What engaged your senses while you were there? If you can answer these questions, then you may have just tapped into your own ability to heal wounds.
Whom do they worship?
There is really no limit to whom bards worship, although gods related to trickery seem to be more common choices. They are not required to follow a deity in order to gain access to their powers, but many find it helps.