Open-Source RDBMS Name

Hello Everyone, I am new in this community, I am confused to define open-source RDMS name. Did someone ask me this question name one open-source RDBMS? and I have no answer at that time. I have researched and found this but still, I am confused. Can anyone here be DBMS expert who explain to me name any 2 to 3 open source name? or suggest me some related question which is useful for my upcoming interview.

RDBMS - Relational Database Management System.

Easiest Examples are:

  1. MySQL
  2. MariaDB
  3. PostgreSQL
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