Cyworld (Hangul: 싸이월드) is a South Korean social network service operated by SK Communications (Hangul: SK커뮤니케이션즈), a subsidiary of SK Telecom (Hangul: SK텔레콤).
Members cultivate relationships by forming Ilchon (Hangul: 일촌, Hanja: 一寸) or "friendships" with each other through their minihompy.
Avatars and "mini-rooms", small, decorate-able, apartment-like spaces in an isometric projection, also feature. All of this can make for a The Sims-like experience.
The "Cy" in Cyworld could mean "cyber" but is also a pun on the Korean word for relationship (Hangul: 사이 'between').
Revenue is generated through the sale of dotori (Hangul: 도토리), or acorns, which can then be used to purchase virtual goods, such as background music, pixelated furniture, and virtual appliances.
Cyworld also has operations in China and Vietnam.