A Cockpit Voice Recorder (CVR) is a device used in aircraft to capture audio recordings from the cockpit. It records conversations between the flight crew, as well as sounds from the aircraft's environment, such as alarms and engine noise. This information is crucial for investigating incidents and improving flight safety. CVRs typically store data for a minimum of 2 hours and are designed to withstand extreme conditions, including high temperatures and impact forces. They are part of the broader category of Flight Data Recorders (FDR), which also track various flight parameters, aiding in accident analysis and prevention.