Higher resolution means higher detail, and can be measured in dots per inch (DPI). ... When it comes to printing, resolution is super important, as a high-quality image looks beautiful and professional, whereas a low-resolution image looks fuzzy, indistinct and completely unprofessional.
Why resolution is important for any picture?
Higher resolutions mean that there more pixels per inch (PPI), resulting in more pixel information and creating a high-quality, crisp image. Images with lower resolutions have fewer pixels, and if those few pixels are too large (usually when an image is stretched), they can become visible like the image below.
Does resolution really matter?
The larger the resolution, the higher the strain on the video card. This is because every pixel on the screen is refreshing at once. More pixels equal a higher strain. While 1920 x 1080 x 60FPS is fine for even low-end video cards, higher resolutions and refresh rates do pose a challenge even for high-end cards.