Cracks, or breaks, are visible separations or fractures in materials, such as rock, glass, or concrete. They can occur due to various factors, including stress, temperature changes, or aging. Cracks can vary in size and depth, affecting the integrity and strength of the material. In construction, cracks in structures like buildings or bridges can indicate potential problems. Engineers often assess these cracks to determine their cause and severity, which helps in planning repairs or reinforcements. Monitoring cracks is essential for maintaining safety and longevity in infrastructure.