dpi means nothing, only pixel resolution is important which is the same in Camera zoom - article below from Dpi, misunderstandings and explanation, what is dpi
You can find the properties of your digital photos in a photo editing program, but also in the Windows Explorer. Do a rightclick on your file and next: Properties > Summary > Advanced. These properties are called the EXIF-data. Or short EXIF. In that row also a value for dpi is given, f.e. the number 72, 180, 300 etc. This is a number without any meaning, it is an invented number! A box (field) has to be filled in, so every producer simply invents a number. Don't get confused, it is nonsense.A photofile in a camera or (stored at) a computer has no size in centimeters or inches. So no ppi (or dpi). Such a file only has a subdivision, a resolution, in pixels. From the moment you are going to print there is the matter of size, given in inches or centimeters. Only then you can speak of pixels per inch
Sarah, you are correct that DPI means nothing if you are using the picture for Social web sites, and viewing on a monitor. If you want to print, then the DPI not only means something it means everything. Anything you print that is less than 300 dpi will not print at decent quality.
By the way the article that you reference even states that if you read way down. I can't believe that the writer of that article states that it means NOTHING, when later he contradicts himself. DPI (or dots per inch) is absolutely important for printing of digital media. If it is truly being saved at 72 dpi then the picture is good only for file sharing via social networks or showing someone on your phone or PC screen.
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