VoiceThread is a tool that allows users to create slideshows with pictures and add audio, text, or animated comments to each picture. Users can record individual comments describing each picture and others can explore the slideshow to view the pictures and listen to the comments. VoiceThreads can be used to share stories, collect views from groups, or create records of discussions on a topic. The document provides instructions on how to get started with a basic VoiceThread including uploading pictures, recording audio comments, and publishing the VoiceThread for others.