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

Please include a introduction and a conclusion 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?