The worlds of politics, business, sport and entertainment joined forces today to pay tribute to Apple co-founder Steve Jobs.
Here is a selection of the tributes.
US President Barack Obama: "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."
Former prime minister Tony Blair: "As much as anyone in any walk of life in the early 21st century he changed people's lives simply by imagination and determination. His memory will serve as a symbol of what the human mind can achieve."
Bill Gates, founder of rival company Microsoft and Mr Jobs's friend: "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."
Tim Cook, who replaced Mr Jobs as Apple chief executive: "Steve leaves behind a company that only he could have built, and his spirit will forever be the foundation of Apple."
BBC Director General Mark Thompson: "It's hard to think of anyone who changed our world more over the last 10 years."
Irish premier Enda Kenny: "Steve Jobs was a creative genius who broke down walls in business and opened doors in people's minds."
Ratan Tata, chairman of Tata Sons, the global business group: "Apple's products, under his leadership, have had a profound impact on mankind, unequalled by any other company in the information and technology space."
Facebook founder Mark Zuckerberg: "Steve, thank you for being a mentor and a friend. Thanks for showing that what you build can change the world. I will miss you."
David Clarke, chief executive of BCS, the Chartered Institute for IT: "His legacy is assured and his ideas are likely to shape the world for generations to come. He will undoubtedly be missed."
The following were taken from Twitter:
Simon Pegg, star of Shaun Of The Dead: "Very sad to hear about Steve Jobs. An innovator and trailblazer, whatever your tech tribe. Rest IP."
Radio 1 DJ Zane Lowe: "Steve Jobs RIP. A man whose exceptional vision helped to greatly sharpen ours."
Journalist and author Tony Parsons: "The death of Steve Jobs recalls the grateful sadness felt when John Lennon and Joe Strummer died. One dreaming man truly can change the world."
Writer and comedian Stephen Fry: "He changed the world. I knew him a little and admired him entirely."
Referring to the improved, updated versions of iPhones, comedian David Baddiel joked: "If only God was more like Apple, and could bring him back as Steve Jobs 2S."
BBC Radio 2 presenter Jeremy Vine described Mr Jobs as an "utter genius" and "officially irreplaceable".
Breakfast television presenter and Strictly Come Dancing contestant Dan Lobb: "I have a MacBook Pro, two iPods and an iPhone. Is my life more enhanced and more fun with them? A resounding yes! Sad to hear Steve Jobs has died."
Lord Sugar: "We started our computer biz at same time and were competitors thru 80's. Great visionary. Sadly missed RIP."
Comedian Patrick Kielty: "By now, Moses will have the Commandments on an iPad. RIP Steve Jobs."