Question 1

What is screen resolution?

Accepted Answer

Screen resolution refers to the number of pixels displayed on your screen, expressed as width x height (e.g., 1920x1080). Higher resolution means more pixels, which results in sharper images and text. Common resolutions include 1080p (Full HD), 1440p (QHD), and 2160p (4K UHD).

Question 2

What is the difference between screen resolution and viewport size?

Accepted Answer

Screen resolution is the physical pixel count of your display hardware. Viewport size is the area your browser uses to render web content, which is typically smaller than the full screen (accounting for toolbars, taskbar, etc.). On high-DPI (Retina) displays, the viewport in CSS pixels may be smaller than the physical resolution.

Question 3

What is Device Pixel Ratio (DPR)?

Accepted Answer

Device Pixel Ratio (DPR) is the ratio between physical pixels and CSS pixels. A DPR of 2 (common on Retina displays) means each CSS pixel is rendered using 2x2 physical pixels, resulting in sharper text and images. Standard displays have a DPR of 1.

Question 4

What is aspect ratio?

Accepted Answer

Aspect ratio is the proportional relationship between the width and height of your screen. Common aspect ratios include 16:9 (widescreen, most common for monitors and TVs), 16:10 (common for laptops), 21:9 (ultrawide monitors), and 4:3 (older monitors and iPads).

Question 5

What is DPI and why does it matter?

Accepted Answer

DPI (Dots Per Inch) or PPI (Pixels Per Inch) measures pixel density. Higher DPI means more pixels packed into each inch, resulting in sharper visuals. For reference, standard monitors are 72-96 DPI, Retina MacBooks are around 220 DPI, and modern phones can exceed 400 DPI.

Question 6

Why does my screen resolution look different than what I set?

Accepted Answer

Your operating system may use display scaling to make text and UI elements more readable on high-resolution screens. For example, a 4K (3840x2160) monitor at 200% scaling will report a viewport of 1920x1080 CSS pixels. The physical resolution hasn't changed — the OS is using more physical pixels per UI element.

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