That’s it’s only significance. For example, if you have a 3000×2000 pixel image, with an embedded DPI value of 300 DPI, whatever image editor you’re using will tell you that your print from that image, if physically printed at the embedded DPI value of 300, will be 10×6.67 inches.

It will reduce file size and scanning speed, but also quality. Its usually shown under the "Resolution" tag of most Deskjets under the HP Scan window. The usual range for scanning regular documents without loosing too much quality is 300 dpi to 600 dpi, 600 dpi being recommended if you might need to zoom-in later on some page.
320 pixels x 320 pixels is 0.1MP per square millimeter. 35mm film is 24 x 36mm, or 864 square millimeters. To scan most of the detail on a 35mm photo, you'll need about 864 x 0.1, or 87 Megapixels. That's about 8128 DPI. But in practice, consumer lenses and higher ISO films don't record that much detail.
This setting selects the output resolution for the scan. Available resolution options are: 50, 75, 100, 150, 200, 300, 400, 600, 800, 1200, 1600. The following values can be input directly: 25 to 3200 (in 1 dpi increments), 6400, 9600, or 19200. Determine the best scan resolution setting. You can specify the desired scanning resolution within
One thing to note, however, is the bank may require the DPI to be in the image's metadata. You can use GIMP to format the image with Image > Print Size and setting the parameters appropriately: 1 "dots per inch" is synonymous with "pixels per inch" in this case. If your camera is capable of 1.5 megapixels or more, it should be able to meet the

Conclusion: 300 to 600 dpi. For resolutions below 300 dpi,a the scanner loses information. This makes 300 dpi a minimum setting for music that musicians will read. If your scan will be archived to sites such as IMSLP, the expectations are higher. As of July 2017, IMSLP: Scanning Music Scores specifies 600 dpi, and IMSLP: High Quality Scanning

It is the actual number of pixels that the scanner provides when scanning an image. The higher the optical resolution, the higher the quality of the image captured. Measured in dots per inch (dpi). Not to be confused with interpolated resolution. 300 dpi will do well for most office applications.
If scans have a smaller resolution, for example, 200 dpi, then 10 point font size will occur to be too small for a good quality OCR result. To compensate for the “missing” pixels, the image will be internally scaled up (up to 400 dpi). The low image quality caused by the low resolution may lead to lower OCR accuracy.
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Consequently, higher DPI settings often mean slower scanning speeds. Imagine this: scanning at a jaw-dropping 1200 DPI versus a modest 300 DPI. The scanner works four times as hard, grabbing four times more data per inch and thus stretching out the scanning time. But fear not, fellow scanner aficionados!
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    • 200 dpi vs 300 dpi scanning