"오빠" (oppa) is a Korean term used by females to refer to an older brother or an older male friend. It conveys a sense of affection and respect. In Korean culture, the term is often used in various contexts, including family, friendships, and even romantic relationships. The use of "오빠" reflects the importance of hierarchy and age in Korean society. It is common for younger females to call older males "오빠" as a way to show familiarity and warmth. This term is also popular in K-dramas and K-pop, where female characters often use it to address their male counterparts.