VoiceThread is an interactive collaboration and sharing tool.

With VoiceThread, users can add images, documents, and videos. Commentators can add remarks by means of microphone, webcam, keyboard, or telephone. This allows for group discussion, analysis, or presentation around shared media.

VoiceThread Overview
What is a VoiceThread? (Video from Blackboard)
Adding VoiceThread to Your Course
VoiceThread in Blackboard (from Blackboard)
Setting Up an Assignment Link
Grading Student Work
Assignment Submission Guide for Students (from Blackboard)