# 1.1.1 Introduction - Cloud Computing

* Define [cloud computing](https://contrxl.gitbook.io/contrxl/systems-administration/microsoft/az-900/1.-cloud-concepts/1.1-describe-cloud-computing/1.1.2-what-is-cloud-computing).
* Describe the [shared responsibility model](https://contrxl.gitbook.io/contrxl/systems-administration/microsoft/az-900/1.-cloud-concepts/1.1-describe-cloud-computing/1.1.3-the-shared-responsibility-model).
* Define [cloud models, including public, private and hybrid](https://contrxl.gitbook.io/contrxl/systems-administration/microsoft/az-900/1.-cloud-concepts/1.1-describe-cloud-computing/1.1.4-define-cloud-models).
* Identify appropriate use cases for each model.
* Describe the [consumption based model](https://contrxl.gitbook.io/contrxl/systems-administration/microsoft/az-900/1.-cloud-concepts/1.1-describe-cloud-computing/1.1.5-define-the-consumption-based-model).
* Compare [cloud pricing models](https://contrxl.gitbook.io/contrxl/systems-administration/microsoft/az-900/1.-cloud-concepts/1.1-describe-cloud-computing/1.1.5-define-the-consumption-based-model).
* Provide a [summary](https://contrxl.gitbook.io/contrxl/systems-administration/microsoft/az-900/1.-cloud-concepts/1.1-describe-cloud-computing/1.1.6-summary-cloud-computing).
