Affiliate/Partner program – marketing instrument for boosting sales and blanket distribution of the product.
Referral link – most often these are links that are integrated to web page code or other resources (apps, blogs, social networks and others). There’s also a capability of affiliate widgets, which enables you to implement referral code into your site.
Reseller Program is a sort of partnership opportunity where a vendor sends revenue share to partner for each build he sends.
SaaS White Label Program is a model of partnership where partners relabel company white-label plugins and sell them to the audience.
Affiliate tracking is transactional analysis for each user who clicked on your referral links. Most commonly it is automatically displayed in your affiliate admin panel.