What is the Pulse app?
Instead of using Brightspace in a browser, it is also possible to use the app developed by D2L: Pulse
Pulse is the app for Brightspace, available in the Play Store (Android) and App Store (iOS). If you do not want to use a separate app for Brightspace, it is always possible to open Brightspace through a browser; this will also work.
You now know what the Pulse-app is!