Apple kept its plans for the iPod secret, using hints and limited information to build curiosity. When it was unveiled in 2001, it became an overnight success due to its surprise announcement, impulse purchases on launch day, and Apple's promotional strategies like partnering with hotels and brands. Apple positioned the iPod as a "cool" device through its design and hype, though surveys later showed users valued its features over aesthetics. The iPod became a large source of revenue for Apple, representing 28% of sales in 2008 through various models and strong brand recognition.