What is Public Cloud?

The public cloud is the most common model of cloud. It refers to a company’s reliance on a third-party cloud service provider to make resources, such as applications and storage, available to the general public over the internet. In contrast to a private cloud, the public cloud is able to provide services to multiple clients using one shared infrastructure.

Public clouds are used mainly by private individuals who are less likely to need the level of security and infrastructure provided by a private cloud, but in some cases, enterprises will utilize this model when storing non-sensitive information. For its users, this type of cloud provides the best economies of scale and is inexpensive to set-up because application, hardware and bandwidth costs are covered by the provider. Subscribers enjoy a pay-as-you-go charging model whereby they only pay for the cloud services they utilize.

Being publicly available, this cloud model is most common in the as-a-Service offerings such as Software as-a-Service (SaaS), Infrastructure as-a-Service (IaaS) and Platform as-a-Service (PaaS). Some additional benefits of the public cloud include the following:

  • Availability: Being available through the internet, a public cloud ensures 24/7 access of data and a remote functionality for the client, whenever an internet connection is present
  • Scalability: On demand access of the public cloud allows applications to automatically respond to activity
  • Reliability: Being spread across a number of servers, networks and redundancy configurations, the public cloud service is unaffected in the case of one of these physical components failing
  • Flexibility: The public cloud can be integrated into private cloud services to create a Hybrid Cloud, which offers a secure storage option for private and enterprise clients.

The Public Cloud does have limitations that make it less than ideal for organizations using sensitive data or that are subject to compliancy regulations, including:

  • Configuration
  • Security
  • SLA Specificity

To learn more about as-a-Service offerings, visit KeyCloud’s Cloud Services