300 DPI stands for 300 dots per inch, which is a measure of image resolution. DPI refers to the number of pixels contained per inch, and the higher the number of pixels, the higher the quantity of information or precision in the image. In other words, DPI is a measure of how many dots of ink or toner a printer can produce in a linear inch. The number of pixels in an image depends on the size of the image. For instance, a 300 DPI image corresponds to 300 (length) x 300 (height) pixels image, which means 90,000 pixels.

To calculate the number of pixels needed for a specific DPI, you can use the following formula:

• Pixels = (DPI x Inches)

For example, if you want to print an image that is 8 inches by 10 inches at 300 DPI, you would need to have an image that is 2400 pixels by 3000 pixels (8 x 300 = 2400 and 10 x 300 = 3000).

In summary, 300 DPI means that there are 300 pixels per inch in an image, and the number of pixels in an image depends on the size of the image.