A referral partner is an Internet marketing term that refers to a company or an individual that sends prospective leads to the primary website via their website, blog, Web page, group, email or through any other Internet-based link-sharing method.
Referral partners are part of an affiliate network, which allows advertisers or primary website owners to partner with affiliates to promote their products and services on an affiliate-maintained website, blog or through a social network.
A referral partner is also known as affiliate or affiliate partner
Techopedia explains Referral Partner
Referral partners are an Internet marketing resource that can send targeted traffic toward the advertiser’s domain. Referral partners are selected by advertisers based on their website's subject. The partners write reviews and feedback about the product or place an ad for the advertiser. Whenever an ad is clicked and the prospective buyer performs a specific activity on the advertiser’s website, the referring website is paid a commission depending on the type of action performed by the referred user.
These actions are usually sales, so the referral partner is paid only when the referred user buys a product or service and/or registers itself with the website to become a prospective lead. Referral partners are normally website and blog publishers producing content in a similar category as the products or services the advertiser is selling. For example, a technology blogger might rate a list of smartphone apps and provide links to pages where those apps can be purchased. When a website visitor buys an app, the blogger gets paid.