When printers started to be interested in computers, they still worked with their own units like pica etc.
Now the computer designers changed the value of one pica a little so that it became exactly 1/6th of an inch.
And as one pica is divided into 12 points, there are 6x12=72 points in one inch. So they made their monitors in such a way that one picture unit (pixel) represented one point, and from there the mixing up of points per inch, pixels per inch etc etc: in the beginning there was no visual difference.
In fact this should be somewhere on an thread of a few weeks ago, but as far as I remember it was quite long, so I posted this as a new topic.
If you don't work against time, time often works for you.
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