Digital holography had an impressive development in the last years this due in particular to the availability of CCD or CMOS sensors with an increased number of pixels and computer resources.  During the first part of the lecture some techniques for recording and reconstructing digital holograms are described and their applications for the investigations of deformations and shape of large and microscopic technical object are shown. We will see as well that holography can be used for the visualization of biological sample.     In the last part of the lecture we will describe new approaches where holograms of self-emitting or incoherently illuminated object are recorded and reconstructed. Furthermore we will learn how digital holography can be used for solving the "Looking around the corner" problem.     Contents of the lecture     Basics:  - Digital recording and reconstruction of holograms     - Holographic interferometry  - Vibration measurement  - Investigation of deformation of MEMS and MOEMS  - Investigation of art objects  - 3D shape measurement     - Holographic Microscopy  - Resolution limits  - Biological studies of microorganisms  - Remote Laboratory for Holographic Microscopy     - extension of the spectral range  - X-ray digital holography  - Ultraviolet digital holography  - Infrared digital holography     - Unconventional digital holography  - Holography with partially coherent