Jobs, 56, was a pancreatic survivor and had been battling poor health for several years. He was surrounded by his wife and immediate family when he died in Palo Alto, California.
He died one day after Apple unveiled its latest iPhone, the gadget that transformed mobile communications.
Apple announced his death without giving a specific cause and board of directors issued the following statement:
"We are deeply saddened to announce that Steve Jobs passed away today.
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.
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."
Statement from US President Barack Obama:
Michelle and I are saddened to learn of the passing of Steve Jobs. Steve was among the greatest of American innovators - brave enough to think differently, bold enough to believe he could change the world, and talented enough to do it.
By building one of the planet’s most successful companies from his garage, he exemplified the spirit of American ingenuity. By making computers personal and putting the internet in our pockets, he made the information revolution not only accessible, but intuitive and fun. And by turning his talents to storytelling, he has brought joy to millions of children and grownups alike. Steve was fond of saying that he lived every day like it was his last. Because he did, he 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.
The world has lost a visionary. And there may be no greater tribute to Steve’s success than the fact that much of the world learned of his passing on a device he invented. Michelle and I send our thoughts and prayers to Steve’s wife Laurene, his family, and all those who loved him.
Google has put rivalries aside to pay tribute to Steve Jobs on its homepage. Under the company’s trademark search box, a message simply reads: “Steve Jobs, 1955-2011,” and links to Apple’s homepage.
Google co-founder Sergey Brin:
"From the earliest days of Google, whenever Larry and I sought inspiration for vision and leadership, we needed to look no farther than Cupertino. Steve, your passion for excellence is felt by anyone who has ever touched an Apple product (including the macbook I am writing this on right now). And I have witnessed it in person the few times we have met. On behalf of all of us at Google and more broadly in technology, you will be missed very much. My condolences to family, friends, and colleagues at Apple."
Google co-founder Larry Page:
"I am very, very sad to hear the news about Steve. He was a great man with incredible achievements and amazing brilliance. He always seemed to be able to say in very few words what you actually should have been thinking before you thought it. His focus on the user experience above all else has always been an inspiration to me. He was very kind to reach out to me as I became CEO of Google and spend time offering his advice and knowledge even though he was not at all well. My thoughts and Google's are with his family and the whole Apple family."
Microsoft chairman Bill Gates:
Steve and I first met nearly 30 years ago, and have been colleagues, competitors and friends over the course of more than half our lives.
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.
For those of us lucky enough to get to work with him, it's been an insanely great honor. I will miss Steve immensely."
Twitter CEO Dick Costolo:
Facebook founder Mark Zuckerberg:
Yahoo co-founder Jerry Yang:
Rupert Murdoch, chairman and CEO News Corp: