Under IaaS offerings the client is offered virtualized hardware resource so that they can install the software environment they require, before building web application. However, on a PaaS service, the client is provided with software environment, on which they can directly install and develop their web application. Nevertheless, businesses with complex experienced IT professionals and IT infrastructures may opt for more customizable IaaS model, but normally, may prefer the PaaS option that is easy.
Cloud hosting involves using public cloud models and these ensure your data is kept safe and suffices the website installations. Conversely, businesses can turn to cloud hosting if privacy and security is your major concern as they use ring-fenced resourced location on the site.