In 2034 Batman will become public domain. Can someone explain what this means for the copyright vs trademark? How will this affect DC Comics?

As the title says. I saw a post about the new Winnie the Pooh horror movie and a comment mentioned Batman going public domain about 10 years.

I tried doing a Google search out of curiosity but none of the results had the exact answer I was looking for - just a bunch of articles talking about what you as the consumer will be allowed to do.