The purpose of this study is to provide an introductory presentation of the Colombian antitrust regime, in a very specific aspect: the administrative liability that may be incurred by the various market players for the implementation of restrictive practices of competition. Therefore, this book is intended for non-experts in the field: students, lawyers, judges and non-specialized judicial officials, as well as professionals from other areas who are beginning their exploration of this discipline of commercial law, with the objective of providing the reader with a global vision of the subject, allowing him/her to identify those aspects on which he/she wishes to study in depth.