Power BI Desktop The Windows-desktop-based application for PCs and desktops, primarily for designing and publishing reports to the Service.
Power BI Service The SaaS (software as a service) based online service (formerly known as Power BI for Office 365, now referred to as PowerBI.com or simply Power BI).
Power BI Mobile Apps The Power BI Mobile apps for Android and iOS devices, as well as for Windows phones and tablets.
Power BI Gateway Gateways used to sync external data in and out of Power BI. In Enterprise mode, can also be used by Flows and PowerApps in Office 365.
Power BI Embedded Power BI REST API can be used to build dashboards and reports into the custom applications that serves Power BI users, as well as non-Power BI users.
Power BI Report Server An On-Premises Power BI Reporting solution for companies that won’t or can’t store data in the cloud-based Power BI Service.
Power BI Visuals Marketplace A marketplace of custom visuals and R-powered visuals.