| Definition |
A category of software managing relational databases |
One popular open-source RDBMS |
| Scope |
Concept + many implementations |
One implementation of RDBMS |
| Examples |
Oracle, PostgreSQL, MS SQL Server, MySQL |
Only MySQL |
| Ownership |
Not owned (general concept) |
Owned by Oracle Corporation |
| Usage |
Generic data storage & management |
Often used for web apps, CMS, e-commerce |