Dynamic spectrum access is a technology that allows devices to use available radio frequency spectrum more efficiently. Instead of fixed allocations, it enables users to access frequencies on a temporary basis, depending on real-time availability. This approach helps reduce interference and maximizes the use of limited spectrum resources. By employing techniques like cognitive radio, devices can sense their environment and identify unused frequencies. This flexibility supports various applications, including wireless communication and Internet of Things (IoT) devices, leading to improved connectivity and better overall network performance.