"사용자 이름" translates to "username" in English. It is a unique identifier chosen by a user to represent themselves on various online platforms, such as social media, forums, or gaming sites. Usernames help distinguish one user from another and are often required during account creation. A good username is typically memorable, easy to spell, and reflects the user's personality or interests. It can include letters, numbers, and sometimes special characters, depending on the platform's rules. Usernames are important for maintaining privacy and security while interacting in the digital world.