Backing up of our fragile data remains to be the considerable inevitability in computing. Loosing data attributable to disk failures, any theft, or even a dribble of water on the machine could be dangerous impediment to the information protection.Dropbox solves with optimal strategy and implement best Cloud Computing service. There lies myriad number of reasons for Dropbox safety and quality in terms of service and superiority.I could have judge this supremacy from very initial stages of Dropbox.

• Name (Branding) - A perfect name was chose for. Initially this name portrays their product & use case; also their name can be spelled easily. Drop-Box. Easy as that I think their name is big reason for their sensation in the market.
  
• Idea = Pain killer - The artifact called Dropbox presents apparent values. They offered what people want. And there lies nothing you cannot appreciate about their conception.
  
• Execution - Clever idea and name could not be the only reason, it is the result of constant tests and improvements in their product and usability. It is also executed perfectly from the very foundation.
  
• Usability - Their design as well as the user experience was very good from the start.
  
• Marketing - They consistently forwarded a landing page that explains their product in a few understandable words.
  Viral Marketing: They use a gossip marketing approach, by fascinating other people to become Dropbox users the users who send the invite gets more free space. Thus, brought in a massive buzz from the early days.
  
• Top-tier VC investors - Dropbox successfully achieved market investors.
  

Some features that are best implemented by Dropbox, unlike its competitors:

Dropbox syncs with everything - Dropbox syncs your data files everywhere. It works like drag and dropping on your computer and then you may access it from the internet via web, mobile device, or any other computer which may be connected to your account. This is Dropbox's best feature implemented like no one could have.

Sharing files is easy - Dropbox makes it easy to exchange records with others. This can be done with non-Dropbox users also.

Dropbox has an app on every device - Dropbox is available on every major platform and the web, making your files accessible no matter where you are and what device you're using.

Incorporates directly with your PC - Dropbox incorporates directly into your PC, just similar to any other folder on your system.

Huge selection of third party apps - Dropbox is open to developers, and there are some incredible apps that make use of its syncing and online storage.