00:00 What is data models?
03:11 Why do we need data models?
05:30 What are the phases of data modelling?
07:00 1. Hierarchical data model
11:00 2. Network data model
14:40 3. Relational data model
24:30 4. Entityrelationship model
28:10 How Relational and Entityrelationship model complement each other
32:40 5. Objectoriented data model

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Data is stored inside the database.
Databases are managed by Database Management System (DBMS).

Structured data is stored inside the Relations (tables) in the Relational Databases.
Relational Databases are managed by Relational Database Management System (RDBMS).