This book, with a foreword by Manuel Castells, explores the core strategies of digital political communication. It reviews the field's evolution over the past 25 years and examines the coexistence of old and new actors (lobbyists, citizens, parliaments, political parties, media outlets, digital platforms, among others), as well as hybrid communication tactics. Topics covered include frames, fake news, filter bubbles, echo chambers, artificial intelligence, the significance of emotions, and engagement with citizens. As we find ourselves in the fourth wave of digital communication, and in the wake of a pandemic which has shaken the foundations of political communication, an evaluation of these topics is essential to the reinvention of democracy. The book is geared towards students and researchers who wish to delve into the latest trends in digital communication, political communication actors and journalists. It further aims to prepare citizens to effectively deal with messaging that blurs the line between truth and falsehood with increasingly powerful strategies supported by artificial intelligence.