The primary function of a liquid crystal display (LCD) is to display visual information through a combination of liquid crystals and light manipulation. LCDs consist of layers that include a backlight and polarizing filters, with liquid crystals arranged in a grid. When an electrical current passes through the crystals, they change orientation, altering the light that passes through them to create images or text. LCDs are widely used in devices such as TVs, computer monitors, and smartphones due to their energy efficiency, slim design, and ability to produce high-resolution images.