what is public cloud. what is private cloud.

2. What is the public cloud?
Public cloud computing is the cloud migration and storage services provided by
third-party cloud vendors over the internet. It gives organizations the ability to
choose their resources on-demand and provides them with a scalable platform
and flexible payment plans. Cloud services are considered "public" when they
are delivered over the public Internet, and they may be offered as a paid
subscription, or free of charge. Architecturally, there are few differences between
public- and private-cloud services, but security concerns increase substantially
when services (applications, storage, and other resources) are shared by
multiple customers. Most public-cloud providers offer direct-connection services
that allow customers to securely link their legacy data centers to their cloud-
resident applications.
Several factors like the functionality of the solutions, cost, integrational
and organizational aspects as well as safety & security are influencing the
decision of enterprises and organizations to choose a public cloud or on-
premises solution.

3. Public cloud is open to all to store and access information via the
Internet using the pay-per-usage method.
In public cloud, computing resources are managed and operated
by the Cloud Service Provider (CSP).
Example: Amazon elastic compute cloud (EC2), IBM SmartCloud
Enterprise, Microsoft, Google App Engine, Windows Azure
Services Platform.

4. How public cloud works?
Public cloud is an alternative application development approach to traditional on-premises IT
architectures. In the basic public cloud computing model, a third-party provider hosts scalable, on-
demand IT resources and delivers them to users over a network connection, either over the public
internet or a dedicated network.
The public cloud model encompasses many different technologies, capabilities, and features. At its
core, however,it consists of the following key characteristics:
•on-demand computing and self-service provisioning;
•resource pooling;
•scalability and rapid elasticity;
•pay-per-use pricing;
•measured service;
•resiliency and availability;
•security; and
•broad network access.

5. Advantages of Public Cloud
Advantages of Public Cloud -
•Public cloud is owned at a lower cost than the private and hybrid cloud.
•Public cloud is maintained by the cloud service provider, so do not need to worry
about the maintenance.
•Public cloud is easier to integrate. Hence it offers a better flexibility approach to
consumers.
•Public cloud is location independent because its services are delivered through
the internet.
•Public cloud is highly scalable as per the requirement of computing resources.
•It is accessible by the general public, so there is no limit to the number of users.
•Organizations should gather useful metrics on the data they store and the
resources they use. Doing so presents another benefit — cloud data analytics.
Public cloud services can perform analytics on high volumes and accommodate
a variety of data types to present business insights.
•The flexible and scalable nature of public cloud storage enables users to store high volumes of
data and access them easily.

6. Disadvantages of Public Cloud
•Public Cloud is less secure because resources are shared publicly.
•Performance depends upon the high-speed internet network link to
the cloud provider.
•The Client has no control of data.
•Businesses cannot customize and optimize the use
of resources on demand, they can only make the best
of what the service provider has to offer. This
one-size-fits-all methodology might be an issue for
companies prone to rapid changes in their business
and cloud strategy.
•Since public cloud platforms are hosted over the
web, with no dependency whatsoever on the on-
premise infrastructure, a connectivity issue might
spell trouble with the entire cloud platform.

7. Public cloud architecture
Is a fully virtualized environment that relies on high-bandwidth network connectivity
to transmit data. Providers have a multi-tenant architecture that enables users — or
tenants — to run workloads on shared infrastructure and use the same computing
resources. A tenant’s data in the public cloud is logically separated and remains
isolated from the data of other tenants.
Providers operate cloud services in logically isolated locations within public cloud
regions. These locations, called availability zones, typically consist of two or more
connected, highly available physical data centers.
Organizations select availability zones based on compliance and proximity to end-
users. Cloud resources can be replicated across multiple availability zones for
redundancy and protection against outages.

8. Summary
Public cloud is one of the simplest of all cloud deployments. When a
resources, platforms or service, he just signs up with the public
access to required resources whenever required. The storage isn’t
simply their data is backed up. Also, clients don’t have to manage
don’t need to check, if their cloud-based platforms, services or
maintained. This is because everything is handled by the cloud
users only make an agreement, use the resources and pay only for
certain amount of time. Since the public cloud service is available
client located at any place is able to access it. This gives any
opportunities such as online document collaboration from multiple
access to IT infrastructure.

9. THANK YOU
Like the Video and Subscribe the Channel