Image resolution refers to the amount of detail an image holds, typically measured in pixels. Higher resolution means more pixels, resulting in clearer and sharper images. Common resolutions include HD (1280x720), Full HD (1920x1080), and 4K (3840x2160). Resolution affects how images appear on different devices, such as smartphones, monitors, and printers. For example, a high-resolution image looks better on a large screen, while a lower resolution may appear pixelated. Understanding resolution is essential for photographers, graphic designers, and anyone working with digital images.