Digital holography is a technique used to capture and reconstruct three-dimensional images of objects. It involves recording interference patterns created by the interaction of light waves with objects and using computational methods to reconstruct the full 3D structure of the objects. Digital holography has applications in various fields such as microscopy, biomedical imaging, and security. It offers advantages over traditional holography techniques such as the ability to easily store and manipulate holograms using digital technology. The field of digital holography is constantly evolving with new advancements in hardware and software leading to improved image quality and expanded applications.