We strive to make the initial encounter with ADRC a smooth and pleasant experience for novices. Therefore, in this chapter, we will rely heavily on illustrative examples inspired by real plants. With such a “show, don’t tell” narration, we want to introduce the fundamental aspects of ADRC for some easily recognizable systems from engineering practice. We purposefully avoid complicated jargon and derivations here to give readers the gist of how the ADRC approach can be used to look at and solve various control problems. We deliberately focus on showing ad hoc solutions for first- and second-order plants as they are the most prevalent. Through the shown illuminative examples, we hope that you will not only start seeing a pattern in the design process of the ADRC methodology but also be intrigued enough about its simplicity and effectiveness to want to explore it further with this book.