Cracks and expansion joints are common features found on concrete surfaces. Cracks often occur due to shrinkage during the curing process or as a result of long-term structural stress. They can be hairline cracks or more significant fissures that can compromise the integrity of the concrete. On the other hand, expansion joints are deliberate gaps created in the concrete to allow for expansion and contraction due to temperature changes. These joints provide flexibility, preventing the concrete from cracking under thermal stress. Both cracks and expansion joints require attention and maintenance to ensure the longevity and safety of the concrete surface. Proper filling and sealing of cracks as well as regular inspection and maintenance of expansion joints are essential to prevent further damage and ensure a durable and functional concrete surface.