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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   packet sniffer
   packet sniffing
   sniffer
      <networking, tool, security> A network monitoring utility program
   that captures data
      packets and decodes them using built-in knowledge of common
   protocols.	Sniffers are used
      to help debug and monitor networking problems.  A sniffer installed
   as malware might capture
      user names and passwords without the user's knowledge and transfer
   them to a criminal.
      (2022-12-07)