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A database-driven web site is often using a three-tiered client-server architecture, which consists of three layers:
- User Interface
- It runs on a PC or workstation (the client) and uses a standard graphical user interface (GUI), which is usually implemented by using (X)HTML and CSS.
- Functional Module
- This level actually processes data. It may consist of one or more separate modules running on a workstation or application server. This tier may be multi-tiered itself. The programming languages used for this module are usually with embedded SQL such as JDBC and PHP.
- Database Management System (DBMS)
- A DBMS is software that manages databases and allows users to access the data in the databases. Two of DBMSs are Oracle and MySQL.