DPI stands for dots per inch, and it is a measure of the resolution of a printed image.
The higher the DPI, the more dots of ink that are used to create the image, resulting in a higher-quality, more detailed, and sharper printed image.
When an image is printed, it is divided into a grid of tiny dots, each one of which is a specific color. The DPI value determines how many of these dots will be used per inch of the printed image.
For example, a printer that has a DPI of 300 will use 300 dots of ink per inch of the printed image. The more dots per inch, the more detailed and higher quality the printed image will be.
It is important to note that the DPI of a printer does not affect the size of the printed image but only its quality. To change the size of the image you need to change the image resolution.
For printing, the general DPI range for high-quality images is between 300-600 DPI. However, some large format printers can go up to 1200 DPI.