Online Services work very much the same way as organizational content packs. They contain connection information for datasets, reports, and usually dashboards. There are, however, some major differences that are listed as follows:
Online services connect to data that is in the cloud. This will likely be an application (or Software as a Service/Saas) to which you subscribe.
The content (reports and dashboards) is created by the software company, not the users, although users can edit and create their own reports and dashboards after they connect to the service.
Connecting to online services does not require Power BI Pro; anyone with a Power BI account (free or paid) can connect, provided they have an account with the application the online services connects with.
Let's walk through an example of connecting to an online service.