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To add to what xmprt and msephton have said, people have told me they use it for:

  - Storing results for scientific research
  - Local analysis of data exported from server-based databases
  - Experimenting with database designs before exporting SQL to codebases
  - Maintaining relational data where a website or app are not needed (eg. tutors keeping client records)
  - Recovering data from databases used by other products (eg. phone backups, discontinued apps)