Layers of a database:
Presentation (where the graphical user interface is, which serves as an interface for the other 2 layers, when requests are sent from the presentation layer, processing starts at the application layer, goes back to the database layer, and finally to the presentation layer again)
Application (where logical operations and load management are completed, message servers are used here for communication)
Database (Database Management System, Database Server - store, update, or delete data from a server, enable security features, can be combined with application later to reduce bottleneck traffic flow)
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