DPI/Digital printing.
If you can get pass this guy's annoying tone of voice you'll find he actually delivers the correct information in a clear way.
DPI stands for Dots Per Inch. If you zoom right into a digital image you can see each individual coloured blocks. When inkjet printers print out a picture, instead of printing the coloured squares it prints dots of ink. The closer the dots are to one another the higher quality the image is going to be, but when you space them further apart the image prints out at a poor quality (a lower resolution). It's worth mentioning that the resolution for print is 300Dpi whereas screen is 72DPI. This is why you should never print images directly from the web. The more pixels in an image the more information you have. If you start with a small image (300px 150 px) you can change the dpi all you want but it won't look good because the digital information isn't there. This becomes much worse when the image is blown up purely because of the lack of information.
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