Scanning and skimming are fast reading techniques used to obtain information from a text quickly. Scanning is used to look for specific information, while skimming is used to get the general idea or gist of a text. When scanning, the reader moves their eyes quickly through the text looking for a particular piece of information, without reading every word. When skimming, the reader looks at titles, subtitles, first and last sentences of paragraphs to get a general understanding of the topic and main ideas. The document provides examples of when each technique would be used and steps for how to scan and skim a text.