How to explain the cloud and cloud computing simply?

I often see the words "cloud" and "cloud computing" on the Internet. I didn't know what these words meant, so I went to Baidu Encyclopedia and found that the more I looked at it, the more confused I was. Here, I would like to ask you to summarize the meaning of these two words in one or two simple and easy-to-understand words (try to explain in easy-to-understand words.

Cloud / Cloud Computing

If you have called the 114 telephone number search desk, it is very easy to understand "cloud" and "cloud computing"! The operator of the 114 phone is the "cloud", and the operator searches the database for the information you want to query and returns the phone number to you. The whole process is "cloud computing". The three numbers 114 are the user interface provided by "cloud computing", simple and convenient!

As for whether the "cloud" is a handsome guy or a robot, the "cloud" is sitting in the Shanghai or Beijing call center, the pose of the beautiful guy in the cloud queries the database, whether it is through a notebook or desktop, whether the back-end database is SQL Server or Oracle, these You are not Care, the only thing you Care is whether the returned number is accurate! Think about why you made that call? Do n’t you just want to know a bunch of phone numbers?

As another example, a user uploads a file to a cloud disk, and if they want to share it with others, they just need to forward the access link (which may include a password) to others, and they can access the file by using this link. This link is a user interface. As for which data center, which computer room, which rack, and which disk array this file is stored in, you don't need to care or care. But the cloud disk service provider knows very clearly that this file link corresponds to the data center, computer room, rack, disk array, and block.

Cloud computing, where "Cloud" means that the internal implementation is opaque, just like the same cloud, you can only see its general outline, but you cannot know the internal details. The complex implementation of cloud computing is covered in a jar, only the lid It is written with an easy-to-use "user interface". The user gives orders to the jar through the user interface, the inside of the jar is full of heat, full power (multi-core CPU) to perform complex calculation (Computing), and then returns the result to the user.

According to different types of open user interfaces, cloud computing is further subdivided into:

• IaaS: lease network equipment to users (user interface)

  

• PaaS: Provide users with a virtual operating system platform (user interface)

  

• SaaS: Provide users with a software service, such as cloud disk (user interface)

However, as a complex internal implementation of cloud computing, thousands of employees are still required for development, operation, and maintenance. The communication between internal devices is still standard TCP / IP communication.

Cloud computing is not a groundbreaking technology. The application of virtual computing and distributed computing, coupled with the widespread popularity of the Internet, has produced cloud computing as a trillion-level industry. This industry has a great demand for software talents, network talents, and security talents. In order to better join the cloud computing team, we still need to learn network and network security!

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