Apple's Steve Jobs dies at 56

Silicon Valley pioneer and Apple co-founder Steve Jobs has died after a seven-year battle with pancreatic cancer.

The 56-year-old was diagnosed with a cancerous tumour in his pancreas in 2004 and has been on medical leave for an undisclosed condition since January 17.

"Apple has lost a visionary and creative genius, and the world has lost an amazing human being," a statement on Apple's website reads.

"Those of us who have been fortunate enough to know and work with Steve have lost a dear friend and an inspiring mentor."

Mr Jobs recently stepped down as chief executive of the company which he co-founded in a garage when he was 21.

Apple's board of directors issued a statement saying they are "deeply saddened" by Mr Jobs' death.

"Steve's brilliance, passion and energy were the source of countless innovations that enrich and improve all of our lives," the directors said in a statement.

"The world is immeasurably better because of Steve.

"His greatest love was for his wife, Laurene, and his family. Our hearts go out to them and to all who were touched by his extraordinary gifts."

He oversaw the company's most prosperous period, including the design and launch of the iPhone and iPad.

Mr Jobs's death came the day after Apple unveiled the new iPhone 4S at its headquarters in Cupertino, California.