What are the common causes of cracks in the mortar between bricks and how can they be effectively repaired?

Common causes of cracks in the mortar between bricks include weathering, settling of the foundation, and poor installation. To effectively repair these cracks, the damaged mortar should be removed and replaced with fresh mortar. It is important to match the new mortar to the existing color and texture for a seamless repair. Additionally, addressing the underlying cause of the cracks, such as fixing any structural issues or improving drainage, can help prevent future cracking.