Produced by Boston-based IDG World Expo, Macworld Conference & Expo is a trade show dedicated to the Apple Macintosh platform with conference tracks occurring twice a year in the United States. The name Macworld is the name of the most widely read Macintosh magazine in North America, and is a trademark of its publisher Mac Publishing, a wholly owned subsidiary of International Data Group. IDG World Expo is also a subsidiary of International Data Group. At one time, the show was known simply as Macworld Expo.