ADIF (Amateur Data Interchange Format) -- A log file format that many logging applications can export. It is not necessary to view or modify ADIF files in order to use TQSL, but for more information, see http://adif.org.uk .
Cabrillo -- A log file format used for the submission of contest logs. It is not necessary to view or modify Cabrillo files in order to use TQSL, but for more information, see http://www.kkn.net/~trey/cabrillo .
Callsign Certificate -- A unique file issued by the ARRL to a user that is used to digitally sign a log file, thereby confirming its authenticity.
Digital Signature -- A cryptographic means of enabling a sender to convey information to a receiver in a manner that assures the receiver that
Digital Signed Log File -- A log file that has been digitally signed by TQSL and can be submitted to LoTW.
Log File -- A file containing QSO records in either ADIF or Cabrillo format.
Station Location -- a collection of information specifying a Callsign Certificate and an operating location: