What is what does sweetheart mean in a relationship?

Sweetheart in a relationship typically refers to a term of endearment or affection for one's romantic partner. It is a way to express feelings of love, care, and closeness to the other person. The term can be used to convey a deep emotional connection and loyalty towards the person, and it often signifies a serious commitment to the relationship. Sweetheart is commonly used as a nickname for a girlfriend/boyfriend, husband/wife, or any intimate partner who is loved, cherished, and appreciated by the other person.