The document discusses the explanation skill, which is an important teaching skill that allows teachers to simplify complex topics for students. It notes that explanation involves making topics easier to understand without losing essential information. Effective explanation should be simple, clear, concise and interesting. It then lists various maxims and components of providing a good explanation, such as using coordination between statements, avoiding irrelevant information, speaking clearly, and including connecting links and clear introductory statements. The document emphasizes that explanation skills are necessary for effective teaching and learning.