The Difference between 72 dpi and 300 dpi

Are you ever confused between the different dpi of photos and the relationship to size and resolution? .. This blog site "fotolia blog" has a great explanation that everyone should have a look at.  The following is a quote from the blog site:

 "DPI stands for dots per inch. In the printing world 300 DPI is commonly used to create sharp beautiful images at a specific size. Many misunderstand that if the digital file does not say 300 DPI that the file is too small or it is less sharp. This misunderstanding is amplified by using programs like Adobe Photoshop where a customer may view a file that says 72 DPI however, the file is very large and perfect for printing. While DPI is important the more important measure of a digital file are the pixel dimensions. The combination of the DPI and pixel dimensions determines the actual printing or document size."

I encourage you to have a good look at the site!