Apple Pages is a free word processor you can download and use on macOS and I guess it's the default word processor. I use Pages some although mostly I do things in text files for BBEdit is easier to use for me. Pages is more for stuff I want other people to read or for stuff I want to print.

It's a fairly basic yet full of features in terms of writing simple to medium length documents. It's not for long books (even though you can publish directly to Apple Books) — I'm thinking back to Microsoft Word v5.1 which had good support for end notes and index and chapters whereas Pages can do it but is more manual about it.

Microsoft Word compatibility seems good. Naturally I communicate with other people via Word files since it's unlikely everyone has Pages but everyone has a word processor that can read Word files. As usual there are some conversion losses going back and forth so for back and forth collaboration of a graphically complex document it would be a bad experience.

Once again it's nice that you can also edit the same Pages documents in iOS, iPad, and iCloud.

I guess there's not that much to say about it. For a free app it's really good. For a paid app (if it were, say $30) it would still be good. I've found that it fills my writing needs for personal writing and when writing documents for my HOA.