A course is a layer of the same unit running horizontally in a wall. It can also be defined as a continuous row of any masonry unit such as bricks, concrete masonry units (CMU), stone, shingles, tiles, etc.

Coursed masonry construction arranges units in regular courses. Oppositely, coursed rubble masonry construction uses random uncut units, infilled with mortar or smaller stones.

If a course is the horizontal arrangement, then a wythe is a continuous vertical section of masonry one unit in thickness. A wythe may be independent of, or interlocked with, the adjoining wythe(s). A single wythe of brick that is not structural in nature is referred to as a masonry veneer.

A standard 8-inch CMU block is exactly equal to three courses of brick. A bond (or bonding) pattern) is the arrangement of several courses of brickwork.

The corners of a masonry wall are built first, then the spaces between them are filled by the remaining courses.