Screen resolution is one of those IT terms that people use without necessarily knowing exactly what it means. We thought it was about time we explained it.
The image on your computer screen is built up from thousands or millions of pixels. The screen creates the image you see by changing the colours of these tiny square elements.
The screen resolution tells you how many pixels your screen can display horizontally and vertically. It's written in the form 1024 x 768. In this example, the screen can show 1,024 pixels horizontally, and 768 vertically:
Now it starts getting a little more complicated. Screens that are different sizes can still have the same screen resolution.
For instance, your laptop could have a 13" screen with a resolution of 1280 x 800. And you could have a 17" monitor on your desk with the same 1280 x 800 resolution.
In this example, although the monitor on your desk is larger, you won't actually be able to fit anything extra onto it. The total number of pixels is the same - just everything looks a bit bigger:
This means that choosing the right screen means you have to take note of both the screen's size and its resolution.
If you're comparing two screens of the same size but with different resolutions, the screen with the higher resolution (that's the one with more pixels) will be able to show you more of what you're working on, so you don't have to scroll so much.
Because that screen has more pixels, the image will be sharper. However, the higher resolution also means that elements on the screen - like icons and text - will look smaller.
Here's another example. It's a real-life one from Dell, to illustrate the difference between two screens available on its XPS 13 laptop.
On the left, a screen with resolution of 1366 x 768. On the right, a screen of the same size with resolution 1920 x 1080:
The higher resolution screen means you can see more of your spreadsheet at once. But it also means the figures in that spreadsheet will look smaller and sharper.
When you're choosing a new computer or display, don't let yourself be guided by screen resolution alone. Brightness and colour representation can vary across screens, so the best way to choose is to sit down in front of a screen and see if you like it.
Having said that, there are a few rules of thumb to help you choose the right resolution:
What screen resolution do you use? Do you ever feel like you need more screen space?