What is when someone calls you sunshine?

When someone calls you sunshine, it is usually a term of endearment or affection. It implies that you bring happiness and warmth into their life, just like the sun brings light and warmth into the world. It can also indicate that the person sees you as a positive and optimistic person, and enjoys being around you. The term may be used between friends, family members, or romantic partners, and can be seen as a compliment to one's personality and demeanor.