What Dictionaries Are — Smarter Data Storage

"You've been storing data in variables and lists. Variables are great for one thing, lists are great for ordered collections — but what about when you need to label your data? A list of expenses like [50.00, 12.50, 8.99] tells you the amounts but not what they're for. A dictionary solves this completely. It stores data as labelled pairs — key and value — so you always know what each piece of data means. This is how almost every real application stores its data."