Slideshow: Steve Jobs 1955-2011

An Apple fan lights a candle at an impromptu memorial paying tribute to Steve Jobs outside the Apple store at Union Square in San Francisco.

Steve Jobs stands beneath a photograph of him and Apple-co founder Steve Wozniak from the early days of Apple during a launch of Apple's "iPad" tablet in San Francisco in January 2010. Mr Jobs stepped down as Apple CEO on August 24, asking the board to name chief operating officer Tim Cook as his successor

Steve Jobs (left); John Sculley (centre), then president and CEO; and Steve Wozniak, co-founder of Apple, unveil the new Apple IIc computer in San Francisco on April 24 1984

Steve Jobs shows off the Apple Macintosh computer on April 4 1986

Steve Jobs poses with the company's new Power Mac G4 Cube after his keynote address at the Macworld Conference and Exposition in New York on July 19 2000

Steve Jobs introduces the new iPod during Apple's launch of their online 'Music Store' in San Francisco on April 28 2003

Steve Jobs unveils a new iPod model available in five colors during a keynote address at Macworld in San Francisco on January 6 2004

Steve Jobs holds the new iPhone in San Francisco, California on January 9 2007

Steve Jobs reveals Apple's iPad tablet computer at an Apple Special Event in January 2010

Steve Jobs speaks about the updated tablet computer, the iPad2, and its case protector in March 2011

Steve Jobs unveils the iCloud storage system at the Apple Worldwide Developers Conference 2011 in San Francisco, California on June 6 2011