The world on Thursday mourned the premature passing of Apple visionary Steve Jobs, who revolutionized computers and transformed modern life with inventions like the iPhone and iPad.
The towering pioneer -- not only in the field of personal computers but also in online music, animated films and marketing -- died Wednesday at the age of 56 after a long battle with cancer.
"Steve\'s brilliance, passion and energy were the source of countless innovations that enrich and improve all of our lives. The world is immeasurably better because of Steve," Apple\'s board of directors said.
Tributes flowed in from world leaders and tech giants, while Apple fans flooded social networking sites to voice their sorrow at the passing of the man who helped put phone-sized computers in millions of pockets.
Ordinary people, many of whom learned of his death on their iPhones and iPads, swamped Twitter to pay tribute to Jobs, generating worldwide traffic that social media analysts expected to shatter records.
Jobs was just 21 when he founded Apple Computer in 1976 with his 26-year-old friend Steve Wozniak in his family garage.
From such humble beginnings the company grew into one of the world\'s most valuable firms, posting second quarter profits of $731 billion in July on revenue of $28.57 billion despite the worldwide economic turmoil.
US President Barack Obama said Jobs had "transformed our lives, redefined entire industries, and achieved one of the rarest feats in human history: he changed the way each of us sees the world."
Wozniak, now 61, told CNN he was "dumbfounded" by news of the death of his former partner, comparing it to the untimely and traumatic loss of John F. Kennedy and Martin Luther King in the 1960s.
"Here is a guy that created tools that everyone in the world -- billions of people -- just love, and feel happy and good about," he said.
Microsoft boss Bill Gates and other titans of the high-tech industry, some of whom had competed with Jobs for decades, agreed.
"The world rarely sees someone who has had the profound impact Steve has had, the effects of which will be felt for many generations to come," Gates said in a statement.
The two men were rivals in the race to dominate the market at the start of the personal computer era.
But while personal computers powered by Microsoft software ruled work places, Jobs envisioned people-friendly machines with mouse controllers and icons to click on to activate programs or open files.
Tim Cook -- who had been handling Apple\'s day-to-day operations since Jobs went on medical leave in January, and was made CEO in August after his resignation -- led the praise for the Silicon Valley legend.
"Steve leaves behind a company that only he could have built, and his spirit will forever be the foundation of Apple," he said in a statement.
Apple turned its home page into a tribute to Jobs, posting a large black-and-white photo of the bearded high-tech maestro in his trademark black turtleneck and small round glasses. The only caption: "Steve Jobs, 1955-2011."
Jobs\'s family also issued a statement, saying he was surrounded by relatives when he lost his long battle with pancreatic cancer.
"In his public life, Steve was known as a visionary; in his private life, he cherished his family," it said.
Born on February 24, 1955 in San Francisco to a single mother and adopted by a couple in nearby Mountain View at barely a week old, Jobs grew up among the orchards that would one day become the technology hub known as Silicon Valley.
Under Jobs, Apple introduced its first computers and then the Macintosh, which became wildly popular in the 1980s.
He was elevated to idol status by ranks of Macintosh computer devotees, but left Apple in 1985 after an internal power struggle and started NeXT Computer company, specializing in sophisticated workstations for businesses.
He then co-founded Pixar animated studios in 1986 from a former computer graphics unit he bought from movie industry titan George Lucas. The studio has since produced acclaimed films like "Toy Story," "Finding Nemo" and "Wall-E."
Apple\'s luster faded after Jobs left the company, but they reconciled in 1996 with Apple buying NeXT for $429 million and Jobs ascending once again to the Apple throne.
Apple went from strength to strength as Jobs revamped the Macintosh line, launching a "post-PC era" in which personal computers give way to smart mobile gadgets -- the iPod, iPhone and the iPad, as well as the popular iTunes site.
His passing will raise doubts over whether the Cupertino, California-based company can continue to dominate the hugely competitive technology sector.
His death comes only a day after Cook presided over the launch of the new iPhone 4S in a move that failed to dazzle investors.
Jobs is survived by his wife Laurene, with whom he had three children. He also had a daughter with a woman he dated prior to marrying.
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