Pixels per inch or PPI like some people say is the amount of pixels per inch on a smartphone display.
A low PPI is typically older, low end devices.(i.e, Motorola Moto E) Lower PPI may include fuzzer text and less detail in photos.
A higher PPI is typically newer higher end phones (i.e, Samsung Galaxy S6).
Having a higher PPI makes text more clearer and more detail in photos.
Here is a picture of an example of PPI

A low PPI is typically older, low end devices.(i.e, Motorola Moto E) Lower PPI may include fuzzer text and less detail in photos.
A higher PPI is typically newer higher end phones (i.e, Samsung Galaxy S6).
Having a higher PPI makes text more clearer and more detail in photos.
Here is a picture of an example of PPI
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