This essential should serve as an introduction for a contemporary public discussion on genetic engineering. Genetic engineering affects us all in many areas and we must dare to think more colorful and further. In fact, the complete genetic material of viruses and bacteria can already be chemically produced and "brought to life". With genetic surgery, medicine is at a crossroads: do we want to treat hereditary diseases or "repair" them genetically? And the analysis of thousands of human genetic material reveals information that is related to complex diseases, but also to characteristics such as intelligence. How should we use this knowledge? The question is hardly whether we want genetic engineering, but rather how we use it. This Springer essential is a translation of the original German 1st edition essentials, Gentechnik by Röbbe Wünschiers, published by The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2019. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors.