We live in a world where the kind of connections you have can make a big difference in your life. These connections are not just about personal and professional relationships, but also about networks. Computer networks must share connections to enable us access to useful information we need online. While these connections help us create a bustling life online, they have also become a cause for worry and concern, hence the need to understand cyber security. In this book, you will learn about the fundamental concepts of cyber security. These are facts that form the foundation of your knowledge in cyber security. The knowledge you gain from this book will help you understand the need to enhance your security online. From office devices to your personal devices at home, you must be keen on securing your networks all the time. We use real life examples to show you how bad a security breach can be. Companies have suffered millions of dollars in damages in the past. Some of these examples are so recent that they may still be fresh in your mind. They help you reexamine your interactions online and question whether you should provide the information that a given website requests. These simple decisions can prevent a lot of damage in the long run. In cyber security today, policy is of the utmost importance. You must understand the policies that guide your interaction with different individuals and entities, especially concerning data security and sharing. This book introduces you to the GDPR policies that were passed in the EU as a guideline for how different entities interact with and handle data they hold in their databases. More importantly, you will also learn how to protect yourself in the event of an attack. Some attacks are multilayered, such that the way you respond to it might create a bigger problem or prevent one. By the end of this book, it is our hope that you will be more vigilant and protective of your devices and networks and be more aware of your networking environment.