Slatwall is kind of building material.

Slatwall (slotwall) is a panel made with horizontal grooves that are configured to accept a variety of merchandising accessories. Standard spacing of these grooves is 3" OC (on-center), but this spacing can be changed to accommodate merchandising density. Optional groove treatments include paint, plastic or aluminum inserts. Panels are typically made from MDF (medium density fiberboard) and meet the demands of store planners and merchandisers worldwide.

It is usually made of medium density fiberboard (MDF) with a melamine paper pressed or laminated onto one or both sides.