Crack detection in cement and concrete refers to the methods and technologies used to identify and characterize cracks within concrete structures. Cracks in concrete can be symptomatic of structural stress, material degradation, or poor construction practices, and they can lead to serious structural failures if not addressed promptly. The process of crack detection often involves visual inspections, nondestructive testing methods such as ultrasonic testing, digital image processing, acoustic emission, and more recently embedded sensor technologies that provide real-time monitoring of concrete integrity.