Steve Jobs, the co- founder of Apple and one of the most well-known innovators, visionaries and geniuses in the world, died on Oct. 5, shocking the whole world.

Jobs had been suffering from a pancreatic cancer. His gaunt appearance had always drawn close attention and made people question his health.

On Wednesday, Apple, the most valuable company in the world, announced Jobs' death, saying, Apple has lost a visionary and creative genius, and the world has lost an amazing human being. Those of us who have been fortunate enough to know and work with Steve have lost a dear friend and an inspiring mentor. Steve leaves behind a company that only he could have built, and his spirit will forever be the foundation of Apple.

The death of tech wizard triggered grief and sorrow as condolence messages poured out in Twitter, Facebook and other social networking sites.

Start the slideshow to see the top 10 biggest achievements of Steve Jobs.

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Apple Inc. CEO Steve Jobs gives a wave at the conclusion of the launch of the iPad 2 on stage during an Apple event in San Francisco
Apple Inc. CEO Steve Jobs gives a wave at the conclusion of the launch of the iPad 2 on stage during an Apple event in San Francisco, California March 2, 2011. Jobs took the stage to a standing ovation on Wednesday, returning to the spotlight after a brief medical absence to unveil the second version of the iPad. Reuters
The main Apple Inc website featuring Apple co-founder Steve Jobs is seen on an iphone in this photo illustration taken in Central Sydney
The main Apple Inc website featuring Apple co-founder Steve Jobs is seen on an iphone in this photo illustration taken in Central Sydney October 6, 2011. Apple Inc co-founder and former CEO Jobs, counted among the greatest American CEOs of his generation, died on October 5, 2011 at the age of 56, after a years-long and highly public battle with cancer and other health issues. Reuters
An iPod displaying a picture of Apple founder and former CEO Steve Jobs is laid near flowers at Hong Kongs Apple store
An iPod displaying a picture of Apple founder and former CEO Steve Jobs is laid near flowers at Hong Kong's Apple store October 6,2011. Apple Inc co-founder and former CEO Steve Jobs, counted among the greatest American CEOs of his generation, died on Wednesday at the age of 56, after a years-long and highly public battle with cancer and other health issues. Reuters
A customer holds an iPad in an Apple store in central Prague
A customer holds an iPad in an Apple store in central Prague, October 6, 2011. Apple Inc co-founder and former CEO Steve Jobs, counted among the greatest American CEOs of his generation, died on Wednesday at the age of 56, after a years-long and highly public battle with cancer and other health issues. Reuters
Apple CEO Steve Jobs shows the new MacBook Air during the Macworld Convention and Expo in San Francisco, California
Apple CEO Steve Jobs shows the new MacBook Air during the Macworld Convention and Expo in San Francisco, California January 15, 2008. Reuters
Mac OS X Lion
apple.com: Mac OS X Lion Reutes
The Apple Inc corporate logo is pcitured in Arlington
The Apple Inc corporate logo is pictured on the rear side of the company's Macbook Air notebook computer in Virginia, August 10, 2011. Apple Inc finished ahead of Exxon Mobil Corp as the largest U.S. company by market capitalization for the first time in history on Wednesday, in face of a steep drop in U.S. equity markets. Reuters
Apple CEO Steve Jobs stands beneath a photograph of him and Apple-co founder Steve Wozniak during the launch of Apples new quotiPadquot tablet computing device in San Francisco
Apple Chief Executive Officer Steve Jobs stands beneath a photograph of him and Apple-co founder Steve Wozniak from the early days of Apple during the launch of Apple's new "iPad" tablet computing device in San Francisco, California, January 27, 2010. Reuters
Steve Jobs
Steve Jobs, CEO of Pixar, poses at the premiere of the new computer animated film " Toy Story 2" November 13 in Hollywood. Tom Hanks and Tim Allen provide the voice talents for the film's characters Woody and Buzz Lightyear, respectively. The film, produced by Pixar, opens November 24 in the United States. REUTERS/Rose Prouser
iPhone4 Now, iPad 3 or iPad Mini Later
The iPad 3 is tipped to have a Retina display, and production might start as soon as January Reuters
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