What does "preview" mean in the context of reading?

In the context of reading, "preview" refers to the act of examining a text before reading it in detail. This can involve looking at headings, subheadings, images, and any introductory or summary sections to gain a sense of what the material is about. By previewing, a reader can establish a framework for understanding the content, which helps to enhance comprehension when they read the text more thoroughly. This practice of gathering prior knowledge can prepare the reader for the main ideas and help them to engage more effectively with the material.