What is comic book 'slabbing'?

What is comic book 'slabbing'?

Mark Zaid (Owner of Esquire Comics) gives expert video advice on: What does a comic book certification company do?; What are the pros and cons of comic book certification? and more...

Comic book slabbing is just another term for certification. It's the taking and submitting of a comic book to an independent grading company and the encasing of the comic book into the plastic container. People call them slabs.