TIFF (Tagged Image File Format) is a lossless (uncompressed) image format. It can be compressed in a lossless way by LZW or Zip compression. Since JPEG images only support 8 bits/channel single layer RGB images, TIFF is therefore widely used as a final format in the printing and publishing industry because it also supports 16 bits/channel multi-layer CMYK images.
Many digital cameras offer TIFF output as an uncompressed alternative to compressed JPEG. Due to space and processing constraints only the 8 bits/channel version is used in digital cameras. Since TIFF files take more storage space than RAW files, it is recommended to shoot in RAW whenever possible.