The term "screen resolution" refers to the number of individual pixels (dots) that fit within a given space. For a 800x600 resolution, the number 800 refers to the number of pixels that the monitor can display horizontally, while the number 600 refers to the vertical limit. Monitor size and optimal screen resolution are closely linked. As you increase the resolution, the screen elements appear smaller i.e. text and icons will appear larger at a resolution of 800x600 than at a resolution of 1024x768.
Resolution refers to the number of pixels, or dots of color, viewable on a display. Resolution is often given as the number of pixels in a row and the number in a column. Generally, the higher the resolution, the sharper the image.
Resolution measured in pixels per inch ( PPI). It helps to think of the image as a grid. As the resolution increases, the size of the grid cells get smaller, in effect increasing the number of cells (pixels) per inch.