Dhamdhere’s Operating Systems: A Concept-Based Approach begins with fundamentals and is an ideal text for the undergraduate students. It presents the operating system as an intermediary between a computer system and a user, one that provides services to the user and also ensures high system performance. A discussion of the operating system’s interactions with the computer, on one hand, and with user computations, on the other hand, consolidates this view and adds practical details to it. This approach demystifies the idea of the operating system and also emphasizes key features of computer architecture that are essential for a study of operating systems.