There's no actual difference between Ambassadors and Affiliates; they are essentially the same. However, within the context of your Affiliate Dashboard, "Ambassadors" refers to the individuals who are directly below you in your affiliate network—think of them as your primary or "front-line" group.
On the other hand, the term "Affiliates" encompasses everyone in your network, which includes both your direct connections (Ambassadors) and those who join through them.
So, when you explore the "Your Network" tab in your Affiliate Dashboard, the header will read "Ambassadors who have directly joined your network." And if you click through one of your Ambassador's downlines, the header will read "Affiliates/Influencers who have indirectly joined your network."
In conclusion, these terms are just labels to help you differentiate between your immediate connections and your broader network.