Ethereal was the original name of the open-source WireShark packet analysis software. It was renamed WireShark in 2006 based on trademark issues.
WireShark is used for network analysis and troubleshooting by allowing users to capture network traffic and view packets. The view of the information can be customized using a display filter. It was originally developed by Gerald Combs in 1998 as Ethereal, before the name change.