This document provides an introduction to digital preservation. It discusses challenges such as hardware and software obsolescence, storage media decay, and loss of information over time. Standards like the UNESCO Charter on Digital Preservation are mentioned, which emphasize the importance of preserving digital heritage. The heterogeneity of digital materials, formats, and metadata are issues that must be addressed. Approaches to preservation like migration, emulation, and normalization are outlined. The importance of preservation policies, metadata, tools, legal issues, and trusted repositories are also summarized.