An array is an ordered collection of data stored together in a single container, where each element sits in a numbered position called an index. Instead of creating many separate variables, an array gathers all those values under one name and keeps them in order. It is one of the most widely used data structures in programming, because it lets you store and go through whole lists —names, scores, or colors— without losing the sequence.
How an Array Works
Imagine you want to store the scores from a game. Instead of three separate variables, you create an array scores that holds them all under one name. In Scratch you use the "List" block, where each value appears numbered on the screen; in Python it is written like this:
scores = [10, 25, 8]
print(scores[0])
One key detail: the first element is not at position 1, but at position 0. That is why scores[0] shows 10 and scores[1] shows 25. This counting from zero is confusing at first, but it is the norm in almost every programming language, from Python to JavaScript.
Why It Matters for Kids
Learning what an array is helps kids organize information just like real programs do: lists of players, a game's inventory, or the questions in a quiz. In Algonova's coding courses kids practice arrays by building their own games, and the concept builds on what a variable is.
You can see it in action in a free trial class, at no cost.
