Optical holography is a promising non-contact 3D imaging technique. Effectively using the coherence property of the light, the optical holography can store the interference information of the object light beam with the reference light beam in a holographic recording medium or a digital camera and retrieve/read-out the 3D image information. Optical holography offers storage, three-dimensional imaging and displays, industrial non-destructive testing and surface profiling, virtual and augmented reality, holographic teleconferencing, and product design and prototyping. This book presents a few recent advancements in holography and its applications.