Having light is all that counts
Available light photography, by definition, is taking photos with available light only, usually meaning natural light. It sounds very simple at first. And it actually is. No heavy lighting equipment and no complicated setups - you work with what is there. And many ideas for photos come naturally.
But that doesn't always work. Sometimes it's simply too dark. The ISO capabilities of cameras are getting better and better, but they are still limited - especially if you're an Olympus photographer. But even if there is enough light, it's often unusable for photos - light coming from the wrong direction, the light color horrible or the light quality is bad. And sometimes the available light is just boring.
So how can wedding photographers cope with insufficient, bad or boring light?
Well, you do what you do all the time in wedding photography: improvise! We simply take "Available Light" literally:
Available light is any damn light available.