Steve Jobs, the co-founder of Apple, has died, according to the company. He was 56. The hard-driving executive pioneered the concept of the personal computer and of navigating them by clicking onscreen images with a mouse. In more recent years, he introduced the iPod portable music player, the iPhone and the iPad tablet -- all of which changed how we consume content in the digital age. Jobs had battled cancer for years, took a medical leave from Apple in January and stepped down as CEO in August because he could "no longer meet (his) duties and expectations."