A codebook is a technical description of the data that were collected for a particular purpose in one or more datasets. It describes how the data are arranged in the computer file or files and what the parts or variables (numbers and letters) mean. A good description may also include specific instructions on how to use & interpret the data properly.
Like any other kind of "book," some codebooks are better than others. The best codebooks include the following elements:
Examples of code books are