What's the difference between wide and extra wide shoes?

Excuse me, I'm a bit confused about the differences between wide and extra wide shoes. Could you please elaborate on the key distinctions? I understand that both cater to individuals with wider feet, but I'm not sure how they vary from one another in terms of width, fit, and possibly even comfort. It would be great if you could also mention any specific scenarios or activities where one might be more suitable than the other. Thank you in advance for your insight.