The television system used in most of Europe, Australia and India. This runs at 25 frames or 50 fields per second and produces 576 visible scan lines. It is often referred to as having 625 lines, but some of these are merely timing lines at the start of each field. Some of these lines can also carry Teletext information and switching signals. Technically, PAL refers to the colour system used rather than the field rate and resolution of the system, but given the ubiquity of PAL across parts of the world, even a monochrome TV based on this rate and resolution tends to be called PAL.