The wall angle defines an elongated body having, in cross section, an angled profile with a first side and a second side extending from an interconnecting edge with the first side.
Corner bead is used in drywall finishing for two reasons: to stabilize and reinforce corners and to cover the visible seam between the two separate drywall boards, creating a seamless 90-degree angle. Corner bead is typically only used on outside corners because it's vulnerable to wear and tear.