The document discusses VoiceThread, an online tool that allows users to upload various media types like images, videos and documents. It then allows people to comment on the media using voice recordings, text, audio or video. VoiceThread facilitates group conversations and sharing in one place. The document provides examples of how VoiceThread can be used for lessons, projects and assessments in various K-12 subjects. It also outlines considerations for using VoiceThread like teaching digital dialogue skills and assessing VoiceThreads. Potential sources of images that can be uploaded to VoiceThread are also mentioned.