Here's a breakdown of its usage:
* Family: It's used to refer to your older brother, regardless of age difference.
* Friends: It's used as a term of respect for older male friends, similar to "bro" or "dude" in English, but with a stronger connotation of respect.
* Other contexts: You can use "hyung" to address an older male figure in a respectful manner, especially in a situation where there's a power dynamic or social hierarchy.
Important note: "Hyung" is only used by males. Females would use "eonni" (언니) for older sister/female friend.