The screen resolution and density factors are universal. They are not tied to a specific type of device or a specific platform. The problem of how to handle different resolutions has been around for decades. More recently, screen density also has become a common topic.
Screen density has become a common topic probably from the time when Apple introduced its Apple Retina display.
We need to familiarize ourselves with some basic terminology (the numerical examples in the following paragraph will refer to my Google Pixel 3a smartphone, featuring a 5.6" display with 2220 x 1080 resolution and a 441 ppi screen density):
- The screen size is the measure of the diagonal of the screen in physical units (inches generally), that is, pixel 3a has a 5.6 inch display (14.22 centimeters).
- The screen resolution is generally stated as a pair of numbers, A x B, where A is the number of graphical units on the width side, and B has the same meaning...
