In plain terms: the copyright page is the page near the front of a book that states who owns the work and carries the standard legal notices.

It's the small-print page you usually find right after the title page. Readers rarely read it, but a published book is expected to have one.
What typically goes on it
- The copyright notice — "© [year] [author]" — and an all rights reserved line.
- Edition / first publication details.
- The ISBN for that edition.
- A disclaimer — for fiction, the "any resemblance to real persons… is coincidental" wording; for non-fiction, a suitable equivalent.
- Optional extras: publisher and print location, cover/interior design credit, permissions for quoted material, a trademark notice, and an AI / text-and-data-mining restriction.
You don't have to write the legal wording
Bookbndr gives you a builder: tick the clauses you want and it assembles a correct, conventional copyright page for you. You can also switch to a manual editor to write your own.
→ To create yours: Add a copyright page.