Where is an Intranet hosted?
If you are using SharePoint as the basis for your Intranet you have some choices which will determine the way in which it is hosted.
SharePoint Online is a cloud-based application that is connected to Office 365. As such, it is always hosted by Microsoft with very little needed to maintain it.
If you choose to use an on-premises version such as SharePoint 2019, you will need to deploy it in custom SharePoint hosting known as a “SharePoint Farm”.
A typical SharePoint farm requires several different servers to handle the application itself, search indexing, user accounts and the document storage. This can be done either in a cloud environment such as Microsoft Azure, or alternatively in a traditional data centre.
At the start of the SharePoint development process for an Intranet, your consultants should discuss the right solution for your needs based on the requirements that you have from your Intranet, and how it will be used.