Wainscoting is the style of indoor wall covering that's made of wooden boards. It's not uncommon for rooms to have wainscoting on the lower half of their walls.
Before the 18th century, wainscoting frequently covered the entire surface of a wall, paneling a dining room or library from floor to ceiling. Newer houses are more likely to have wainscoting only on the bottom part of a wall, if at all. The wall-covering material itself can also be called wainscoting or wainscot. The original wainscoting was made of oak, but softer wood is more common today.