Apple, for the first time in years, is hearing footsteps.

The maker of iPhones, iPads and iPods has never faced a challenger able to make a truly popular and profitable smartphone or tablet — not Dell, not Hewlett-Packard, not Nokia, not BlackBerry — until Samsung Electronics.

Read more: http://finance.yahoo.com/news/samsung-emerges-potent-rival-apple-005226714.html