What is cloud computing

     It's a term referring to the ability of having the software and hardware online from any where.
It's called cloud because of the way it connects all the software and hardware without any arranging.

Software such as Office 2013 that uses the Internet to save and retrieve your files online.
Hardware means you can access the computers from anywhere using remote computer.

Cloud computing is a new term for the normal users but for companies is an old term, they used it to maintain their computer services and to keep their databases organized.

However, that doesn't mean it didn't exist for the normal user, it was there but in a different name: File hosting .
File hosting are websites that give you a space that you can upload your files to from your own computer and you can share it or keep it as back up.
However, they weren't as easy as  now because now you can organize your cloud files without using a browser hence it create a folder in your hard drive and synchronize it with the cloud folder.