affinity

【原文】
The company has also homed in on its most loyal customers through an affinity program it launched in 2010 that keeps track of gamer's buying habits, sends tailored marketing, and offers discounts to those who pay for an annual subscription.

【単語の意味（英語）】
a strong feeling that you understand somebody or something and like them
a close relationship between two people or things that have similar qualities, structures or features

【単語の意味（日本語）】
親近感；相性、強い好み；類似点、親近性