The document discusses different types of texts and how to transcode between linear and non-linear texts. It defines linear texts as those meant to be read sequentially from beginning to end, like novels, while non-linear texts can be read in any order. Examples of non-linear texts include graphs, charts, and diagrams. The document provides steps for transcoding a linear text into a non-linear format, which includes understanding the source text, extracting key details, organizing the information into categories, and selecting an appropriate non-linear text type like a graph or chart to present the information.