If you have a long text document and need a much shorter version that basically covers the core concepts in the full version, the Summarize service built into macOS may be worth examining ...

Google has detailed how the new Assistant AI summaries feature will work in Android Auto to summarize your messages and group chats.

If you have a lot of text files on your computer, distinguishing between them can take a lot of effort. Over on How-To Geek, they remind of us the oft-forgotten feature in OS X called Summarize ...