Snoring means that there's some degree of narrowing of your upper airway behind your soft palate. You snore when you breathe in, due to the fluttering effects of the soft palate. Yes, it's a sleep-breathing disorder. Most sleep doctors state that snoring can be "benign", with varying degrees of severity, with sleep apnea coming in later. But I think that any degree of snoring means partially obstructed breathing, which worsens during deep sleep due to muscle relaxation. It's even been shown that snoring sounds could potentially cause carotid artery plaque buildup and narrowing.