Microsoft Azure provides various services that would help you in computing in one way or the other and these services are clubbed into domains.
Here are a few notable domains:
It is used to process data on the cloud by making use of powerful processors which serve multiple instances at a time.
The storage as the name suggests, is used to store data in the cloud with the ability to scale as and when required. This data can be stored anywhere.
The database domain is used to provide reliable relational and non relational database instances managed by Azure.
It lets you connect to cloud and on-premise infrastructure and services to get great user experience
There are plethora of services you would wanna checkout, you may checkout this stack of Azure Resources to no more.