Apple, formerly known as Apple Computer Company, its core business is electronic technology products. Apple's Apple II fueled the personal computer revolution in the 1970s, and the subsequent Macintosh relay continued to develop in the 1980s. The most well-known products are its Apple II, Macintosh computers, iPod music players, iTunes store, iPhone mobile phones and iPad tablet computers. Known for innovation in high-tech companies. In February 2011, Apple broke Nokia's 15-year sales lead and became the world's largest mobile phone manufacturer. On August 10, 2011, Apple's market value surpassed that of Exxon Mobil, becoming the world's most valuable listed company. On October 19, 2011, a Steve Jobs memorial event was held at Apple headquarters, titled "Commemorating the Life of Steve Jobs."