Extraction tasks are used to extract network communication flows into multiple files, usually one per flow. The basic principle is that frame filters are used to determine which frames are to be extracted, and then saving them to files. Right now there are two ways of doing flow extractions:

  1. using the Conversation Summary, selecting rows for export and using the pop up menu to start the extraction process.
  2. via an Extraction task, which allows to specify in greater detail how the extraction process should do its job

On a side note, double clicking on a row in the Conversation Summary dialog also extracts the according frames to a temporary file and opens the file in Wireshark (or any other tool that is configured to open PCAPng files)