What Is an Array? — Memory Layout, O(1) Access & Dynamic Resizing

Arrays are the simplest data structure — and the one almost every other data structure builds on. In this video we cover what an array actually is in memory, why random access is O(1), why inserting in the middle is O(n), how dynamic arrays like vector/ArrayList grow, and how 2D arrays are really just flat memory in disguise. We cover: 0:00 What is an array? 0:11 Memory layout & O(1) access 0:27 Insertion, resizing & 2D arrays 0:57 Complexity cheat sheet, code & what's next Part of the Data Structures Basics series — built for students learning DSA for coursework or coding interviews. 📌 Prerequisite concepts: none — this is a great starting point 🔜 Next video: Linked Lists #Arrays #DataStructures #DSA #ComputerScience #LearnToCode #CProgramming #BigO