‘Biological information’ outlines the nature of information in genetics and neuroscience. Genes are instructions for creating proteins in organisms, and these instructions are carried through the structure of DNA. The information contained in genes is not semantic, as it does not require meaning to be understood by the cell utilising it. Errors in genetic data reproduction can cause changes in cell function (for better or for worse), and the positive changes, over time, lead to the evolution of more complex body systems, such as the nervous system. This complex network acts to reduce entropy by processing and communicating information.