Mortar is a workable paste that hardens to bind masonry units such as brick, stone, or concrete masonry units. Mortar is used to fill and seal the irregular gaps between the units, distribute the weight of the units evenly, and can also be used to add decorative colors or patterns to masonry walls.

Mortar joints can be tooled in many different ways. The most popular are concave mortar joints that provide superior water management or raked joints that can provide a unique architectural style