The term "px" stands for "pixel," which is the smallest unit of a digital image or display. Pixels are the tiny dots that make up screens, such as those on computers, smartphones, and televisions. Each pixel can display a specific color, and when combined, they create the images and graphics we see. In web design and digital graphics, "px" is commonly used as a unit of measurement for dimensions, such as width and height. For example, a div element might be set to 300px wide, meaning it will occupy 300 pixels across the screen. This precise measurement helps ensure consistent layouts across different devices.