"Black levels" refer to the darkest parts of an image displayed on screens, such as televisions and computer monitors. They determine how deep and rich the blacks appear, affecting overall picture quality. High-quality displays can produce true black, which enhances contrast and makes colors look more vibrant. In digital displays, achieving optimal black levels is crucial for an immersive viewing experience. Technologies like OLED can produce perfect black levels by turning off individual pixels, while LCD screens often struggle with this due to backlighting. Proper calibration can help improve black levels, leading to better image clarity and detail.