Introduction

The chapter illustrates the fundamental characteristics of Public Clouds and the so-called Hyperscalers. The Public Cloud and its abstraction levels Infrastructure-as-a-Service, Platform-as-a-Service, and Software-as-a-Service have been established for several years now. The chapter highlights the important points about the abstraction levels and their specific challenges when in use. Customers and businesses should be aware of the advantages and disadvantages of the Public Cloud during all three phases of its use. To this end, the chapter presents the aspects to consider before, during, and after the use of the Public Cloud.