The public cloud is the basic cloud model, where a third-party provider offers shared and scalable resources, such as applications and storage servers, which users may access over the Internet. Many laaS providers, such as Amazon Web Services, offer pay-per-usage models to which anyone can subscribe.
The Public Cloud offers many advantages. It is the most straightforward and simple, among various cloud deployment, option that offers enterprises the convenience to sign up and set up their required infrastructure with considerable ease in double-quick time. It is very easy to use as well, and generally operates at very fast speeds. An added advantage is the ease to add or shed capacity as required, allowing for unbridled flexibility.
Another significant advantage of the public cloud is its cost-effective pay-per-use model. Most cloud providers offer elastic pay-as-you-go offerings, allowing users to pay only for the resources they actually use, and for the time they use it. Some basic services are even available for free. With Public Cloud, enterprises may shift capital expenditure on IT resources to operational expenditure that can then be better appropriated and passed on accurately to end customers. The public cloud shifts hassles of administration and maintenance to a third-party service provider. Businesses who subscribe to Public Cloud infrastructure share resources with other users who have done likewise.
The public cloud also makes it possible for users to access their resources from just about anywhere on the globe, across any device; the only requirement being right credentials and an Internet connection.
However, for all the benefits, the public cloud does also have its shortcomings. Issues like unreliability or outrages at the cloud server end, where nothing can be done but wait because of third-party control and administration, remain huge. Variable broadband Internet connections could cut data off entirely and leaving access to the cloud also undependable.
Security and legal issues remain the main concern, however, with the public cloud and its shared resources and transactions over the Internet. Susceptible to online hacking as well, the issue of data sovereignty as well is cause for apprehension with data centers outside the country of actual business.