See, cloud computing is over 40 years old. Yes, 40, that's almost as old as computers themselves. The core concept of cloud computing is to have a server some where that hosts your stuff, and it lets everyone connect to it. Sounds cool, right? Well guess what, we've been doing that for a long time. Chances are, the internet server you're connected to (the one hosting this blog) is a Cloud server.
- It hosts media/non-physical objects(computer files)
- You connect to it remotely
- It's available as a service
All of these things are what makes Cloud technology. In a sense, the internet itself is a giant collection of (probably) uncountable servers all available to be connected to.
If you want to learn more about Cloud Computing, I suggest reading the Wikipedia article on it. Link