An array is the simplest and most widely used data structure. Other data structures like stacks and queues are derived from arrays.
A real-life example of a Stack could be a pile of books placed in a vertical order.
Like Stack, Queue is another linear data structure that stores the element sequentially.
A graph is a set of nodes connected in the form of a network. Nodes are also called vertices.
Hashing is a process used to uniquely identify objects and store each object at some pre-calculated unique index called its “key.”