What is meant by Cloud ?

What is a cloud ?
What is the stepping stone of Cloud technology ?
What are their types?
How they are used in Real time World/Companies & etc ?
What are the advantages and disadvantages?
What are the services available in Cloud ?
How this technology emerged ?
Kindly brief and explain me with real time example ......
I referred  many websites and I didn't get the concept correctly can you guys can help me pls ....
Siddarth S

Hi,
Buddy can you please post some video type article so that we can understand the
concepts clearly than theory based article. In theory there will be some technical word
where we can't find the definition exactly but in video type article we can easily guess
and we can understand easily the concepts please help me in this ..... 
Siddarth S

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