Interlacing may refer to any of the following:
1. When referring to a computer monitor or another display, interlace or interlacing is a description of how the picture is created. With an interlaced display the picture is created by scanning every other line, and on the next scan, scanning every opposite line. Interlacing allows for a faster refresh rate by having less information during each scan at a lower cost. Unfortunately, this may cause flickering or noticeable line movements in some situations.
2. Interlacing also refers refer to an interlaced graphic image, such as an interlaced GIF or progressive JPEG. These are images that are displayed by loading either odd or even lines first, and then loading the other lines on the next cycle. For users with slow Internet connections (e.g., dial-up modem), a very large, progressive image appears faded as it loads.