VoiceThread is an online tool that allows users to create interactive presentations by overlaying images, videos, or documents with voice, text, or video commentary. It does not require installation and saves all work to the user's online account. Teachers can use VoiceThread for a variety of classroom applications, such as having students record journal entries, explain math problems, or present science experiments. Some advantages of VoiceThread include engaging students with multimedia, easily updating presentations, and allowing teachers and parents to provide feedback on student work.