In today's globalized and technological world, information technologies advance rapidly, as do the threats against users of these technologies. In fact, we could say that threats are ahead of defenses. Therefore, it is essential for people, organizations, companies and governments to protect critical and sensitive information, since it must be protected and not run risks in terms of privacy and security. It is extremely important to safeguard and protect the privacy of users and prevent the theft of sensitive data, given that there are constant cyberattacks that violate security systems, which makes it clear that many technological infrastructures are vulnerable. In this sense, it is urgent to have effective protection measures against these incidents. Precisely, this text provides the user with a comprehensive view of the foundations that range from basic cybersecurity concepts, legal frameworks and sophisticated encryption and anonymization techniques, to the exploration of critical infrastructure protection and disaster recovery measures; key resilient elements to maintain the security and operation of a digital environment. Through a series of examples, past incidents will be analyzed, highlighting how different industries and governments around the world have strengthened their data protection policies. In addition, this book examines emerging trends and future technologies that will shape cybersecurity in the coming years, such as artificial intelligence, blockchain and quantum cryptography. As authors of this text, we invite readers to dive into this essential knowledge, not only to understand current threats, but also to anticipate future challenges in protecting sensitive and critical information.