Why do you use "alors" instead of "donc"

Question

I don't understand why you use "alors" instead of "donc". I don't get it because alors means so (then, yet) and donc means so, as well (therefore).

Accepted Answer

Hi Ashley, 
This is the page Jim was looking for which includes the excellent Quora explanation.
https://french.kwiziq.com/questions/view/donc-or-alore

Answer

Bonjour Ashley,
Cécile answered a similar question some time ago  --  here is the link
https://fr.quora.com/Quelles-sont-les-diff%C3%A9rences-entre-les-mots-alors-et-donc-dans-la-grammaire-fran%C3%A7aise-Sont-ils-interchangeables
 
The text is in French, however, so I hope that you are able to understand the subtle differences between the two terms.
Bonne continuation
Jim