Trim tile refers to the tile placed along the edges to finish off the main area of an installation. Trim tiles can come in various shapes of bases, caps, corners, moldings, and more. A few common styles include bullnose, featuring a rounded edge; chair rail, which is often used to protect walls from scuffs; and quarter round, which has a subtle trim with a low profile. Trim tiles are available in a variety of colors that can either match the primary tile or create a contrasting look.