What do resolution and DPI mean?

Image resolution determines the size that your image will print. Typically, it's expressed as a horizontal x vertical pixel measurement. For example, an image resolution of 1920 x 1080 tells us that the image measures 1920 pixels in width and 1080 pixels in height. High resolutions mean more pixels, resulting in high-quality, crisp images.

DPI stands for "Dots Per Inch", referring to the number of dots in a printed inch. A higher DPI image contains more dots, producing more image sharpness and detail, and the print quality will be higher accordingly. Vice versa, the lower the DPI, the blurrier the image. See the images below: