A public cloud is a cloud deployment model where the computing services and infrastructure are managed by a third-party provider and shared across multiple organizations via the Internet. Public cloud service providers offer one or more types of cloud-based services like software-as-a-service (SaaS), platform-as-a-service (PaaS), or IaaS from public CSPs such as AWS or Azure, to users for a monthly or pay-per-use fee, without the need of private cloud infrastructure. Cloud service providers use a number of data centers that are divided into virtual machines and shared by tenants. All clouds can become public clouds if the environments are partitioned and redistributed among a larger number of tenants.<\/p>\n

The tenants rent the virtual machines and use the services they provide. Public clouds are recommended for less-sensitive applications or for storing data that does not require frequent access. Public clouds can be a great option if you want to scale existing IT resources without expanding their physical IT infrastructure, or for storing data, because the data stored on a public cloud is backed up and accessible from anywhere. Public cloud computing resources have lower fees or no fees at all this makes them the most cost-efficient compared to the other clouds. They also have lower equipment and maintenance costs. It is also easier to migrate applications to a public cloud.<\/p>\n

Private clouds<\/strong><\/p>\n

On the other hand, private clouds offer computing services over a private internal network solely dedicated to a single user or a private group, where the environment usually runs behind that user or group’s firewall. All clouds can become private if the underlying IT infrastructure dedicates to a single customer with completely isolated access from other users. Private cloud computing has the same benefits as the public cloud-like self-service, scalability, and elasticity but with additional control and customization. Private clouds have a higher level of security and privacy because of the company firewalls and the internal hosting.<\/p>\n

This way it ensures operations and sensitive data are not accessible to third-party providers. There are two types of models in a private cloud infrastructure as a service (IaaS) and platform as a service (PaaS). IaaS allows the use of infrastructure resources such as computing, network, and storage as a service. Meanwhile, PaaS allows the users to use the cloud\u2019s infrastructure resources such as computing, network, and storage as a service. Private clouds can also be combined with public clouds to create a hybrid cloud allowing more free space and scale computing services. The two most common types of private clouds are:<\/p>\n