Content packs for services are pre-built solutions for popular services as part of the Power BI experience.
The subscriber to a supported service can connect to their account quickly from Power BI. You can see their data through live dashboards and interactive reports which have pre-built for them.
Microsoft released content packs for popular services such as Adobe Analytics, Salesforce.com, Marketo, CircuitID, Azure Mobile Engagement, comScore Digital Analytix, SQL Sentry, Quickbooks Online, and tyGraph.