What is Cloud Computing?

What is Cloud Computing?

Cloud is not a specific technic, it is a notion or an way of thinking.

Cloud Computing : Computing Process Service by Cloud vendors not our PC.

Background of Computing

1980s Main Frame

1990s Client & Server

2000s Network & web browser

2010s Cloud Computing

2020s ? we don't know yet

Definition of NIST(National Institute of Standards and Technology)

Here are some NIST definition.

    1. Order-oriented Self Service.

        Client can use it without seller’s help.

    2. Borad Network Access.

        Mobile, Desktop, Laptop, etc. We can access using many kinds of device.

    3. Sharing Resource.

        We use vendor's resource and share it. We don't know where it is.

    4. Rapid Scalability.

        Scale up, Scale down is always ready.

    5. Mesureable Service.

        Pay as much as used.

*ref : Learning Cloud by picture 2nd Edition - Masayuki Hayashi