This is a draft presentation of the 2nd video of the course "Digital forensics with Kali Linux" published by Packt Publishing in May 2017: https://www.packtpub.com/networking-and-servers/digital-forensics-kali-linux In this presentation, we introduce digital forensics and cover the fundamental concepts that should be learned to fully understand the hands-on part of the course. The first part of the video gives a definition of what digital forensics is, explains which application areas it has and the various sub-branches in which is divided. The second part covers the different steps of digital forensics: assessment, acquisition, analysis and reporting. Next, the video explains important concepts like Locard’s principle, order of volatility and chain of custody. Finally, there is a comparison between commercial and open source tools.