To summarize means to give a short version of something longer, including only the most important points. When you summarize a book for a friend, you don't retell every scene: you explain the main plot, key characters, and perhaps what made it interesting or meaningful. When your teacher asks you to summarize an article, you're condensing pages of information into a few clear sentences that capture the essential ideas.

A good summary requires understanding what really matters. If you read a chapter about the American Revolution, your summary might mention the colonists' desire for independence, key events like the Boston Tea Party, and the outcome of the war, but you'd skip minor details, like what individual soldiers ate for breakfast.

The challenge is deciding what to include and what to leave out. Summarizing shows you understand something well enough to explain its core meaning without getting lost in details. Scientists summarize their research in abstracts, journalists summarize news stories in headlines and opening paragraphs, and students summarize their learning to prove they've grasped the material.

The noun form is summary: “Please write a summary of the chapter.”