After the interview, I received this message: I'm sorry you didn't pass the interview, and the company will keep your personal information! What do you mean?

This is a literal understanding. Although they didn't hire you, they still regard you as a talent and will give you priority when there is a vacancy in their staff. In fact, this is just a polite expression. I hope you will not be affected by this recruitment, sum up your own experience and lessons, and continue to cheer for yourself. I believe that your strength will be accepted by better and more discerning units.