Aspect ratio refers to the proportional relationship between the width and height of an image or screen . It's expressed as two numbers separated by a colon, like 16:9 or 4:3 . Here's an explanation of why it matters: Understanding Aspect Ratio: Imagine a rectangle: The aspect ratio describes the ratio of the rectangle's width (horizontal side) to its height (vertical side). Square vs. Rectangle: A square has an aspect ratio of 1:1, because both sides are the same length. Conversely, a rectangle with a typical aspect ratio of 16:9 (like most modern TVs) is wider than it is tall. Why Aspect Ratio Matters: Content Creation: When creating content, like photos or videos, choosing the right aspect ratio is important. A filmmaker might use a cinematic 21:9 ratio for a widescreen epic, while a photographer might prefer a square format for social media posts. Preserving the Look: If you take a photo in 16:9 and display it on a 4:3 screen, you'll likely see black bars o...