1. What is data structure?
A data structure is a way of organizing data that considers not only the items stored, but also their relationship to each other. Advance knowledge about the relationship between data items allows designing of efficient algorithms for the manipulation of data.
2. List out the areas in which data structures are applied extensively?
1.    Compiler Design,
2.    Operating System,
3.    Database Management System,
4.    Statistical analysis package,
5.    Numerical Analysis,
6.    Graphics,
7.    Artificial Intelligence,
8.    Simulation
3. What are the major data structures used in the following areas : RDBMS, Network data model and Hierarchical data model.
1.    RDBMS = Array (i.e. Array of structures)
2.    Network data model = Graph
3.    Hierarchical data model = Trees
click here to download c and c++ material