Data Structure is a way of collecting and organising data in such a way that we can perform operations on these data in an effective way.
Data Structures is about rendering data elements in terms of some relationship, for better organization and storage.

Why Data Structures?
Data Structures and Algorithms are the identity of a good Software Developer. The interviews for technical roles in some of the tech giants like Google, Facebook, Amazon, Flipkart is more focused on measuring the knowledge of Data Structures and Algorithms of the candidates. The main reason behind this is Data Structures and Algorithms improves the problem-solving ability of a candidate to a great extent.