What are the major open-source DBMS and proprietary DBMS systems?

Please include a introduction and a conlusion also please answer the following questions.

What distinguishes open-source database management tools from proprietary database management tools?

What are the major open-source DBMS and proprietary DBMS systems?

Name some examples of organizations’ adoption of open-source DBMS vs. proprietary DBMS.
What are the cost-benefits of applying open-source DBMS vs. proprietary DBMS?

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