Ask HN: What is an ERP reseller?

I often hear words like SAP, Microsoft Dynamics, Oracle, Sage Reseller... Is it essentially an affiliate marketer selling that companies systems to businesses in exchange for a commission? Let's say you are a Microsoft Dynamics ERP reseller. What is the advantage and disadvantage of being an reseller? How do you typically find channels to sell the software to? Do you have more credibility because you are aligned with a brand name company vs rolling your own ERP software? Is it possible for an individual to become a partner/reseller for one of those big name software companies? Have any of you experience in this field, how is the game played? Is it purely a game of making sales? Does experience in software development help? Which reseller program should you choose, obviously the one with the highest comissions?