Index
Domain: Data Structures
🎯 Motivation
To find a specific element in an array, string, or list, you need its position number — the index.
📋 Concrete Example
name = 'Alice' — name[0] is A, name[1] is l, name[-1] is e (counts from the end).
🔗 Analogy
House numbers on a street. To find a house, you walk to its number. Number 0 is the first house at the start of the street.