A binary tree is an extension of the linked list structure where each node has at most two children.
In a queue, the least recently added elements are removed first as opposed to a stack. A queue refers to a linear data structure that performs operations in a FIFO order. Going ahead you will dive deeper into the subject. Till now, you’ve covered some very fundamental coding interview questions. The data that was stored first is extracted first. In a stack, elements can only be accessed, starting from the topmost to the bottom element. A stack refers to a linear data structure performing operations in a LIFO (Last In First Out) order. It extracts the data that was stored last first. It is a way of accessing, storing and retrieving data. LIFO is an abbreviation for Last In First Out. It is basically a sequence of nodes, each node points towards the next node forming a chain-like structure. Like an array, a linked list refers to a linear data structure in which the elements are not necessarily stored in a contiguous manner. It organizes data so that a related set of values can be easily sorted or searched. 
An array is commonly referred to as a collection of items stored at contiguous memory locations.Some popular data structures are Arrays, Trees, and Graphs.A data structure is a storage format that defines the way data is stored, organized, and manipulated.This section covers some coding interview questions that test the conceptual understanding of the candidate. Coding Interview Questions On Conceptual Understanding
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