Skimming and scanning are two strategies for speed reading that involve focusing on different levels of detail. Skimming involves looking for main ideas by reading topic sentences and dropping down through paragraphs. Scanning looks for very specific information by knowing a material's structure and key words. Both techniques allow readers to process large amounts of information quickly by not reading every word. Skimming is used for general understanding while scanning locates precise details. Knowing when and how to skim and scan makes readers more flexible and efficient.