In English, "friendship" is the word used to describe the relationship between friends. It comes from the Old English word "freond," which means "friend" or "lover." Some example sentences and their Chinese translations are:

"Friendship is a special kind of love." (友情是一种特别的爱。)

"A true friend is someone who is always there for you." (真正的朋友是永远为你在的人。)

"Friendship is built on trust and mutual understanding." (友情建立在信任和相互理解的基础上。)