What is CC0 and how does it relate to copyright and licensing?

CC0, or Creative Commons Zero, is a public domain dedication tool that allows creators to waive all their copyright and related rights in their works. This means that the work can be freely used, shared, and adapted by anyone without any restrictions. CC0 is a way for creators to release their work into the public domain, essentially giving up all rights to the work and allowing others to use it without any legal limitations.