DPI = DOTS PER INCH
On the Web everything you see is 72 DPI. Why you ask? Because the files have to be small enough for you to download them and so your monitor and graphics card can actually display them without crashing your computer.
In Printing everything must be 300 DPI. Why you ask? Because you don’t want your brochures to appear blurry and pixilated. (Pixelation is when you can actually see the dots that make up an image)
We Can Not Make a 72DPI Web Image into a 300DPI Image for Print. Why you ask? There are only 72 Dots per Inch! Imagine you had 72 pennies in your hand and someone asked you to magically turn those 72 pennies into $3.00. You wouldn’t be able to because you only have $0.72.
We CAN make a 300DPI Print Quality Image into a 72DPI Web Image. How you ask? Imagine you had 3 Dollars in your hand and someone asked you to give them $0.72. You could go to the bank and have one of the dollar bills broken down into change so that you could give the person: 2 quarters, 2 dimes, and 2 pennies.
EXAMPLE: A Website Graphic at 72 DPI
EXAMPLE: SAME RESULUTION GRAPHIC MADE LARGER (PIXELATED)