The cyber threat landscape is ever evolving, and cyber security needs to be considered as a continuous effort to enable better protection, detection and mitigation of attacks on individual, corporate or national levels. Study of Cyber Security introduces the concepts and terminologies of the latest cyber threat landscape and enables a better understanding of cyber security. The study also unveils the recent attacks and threats, as well as an explanation of each of their mechanisms to acquire a deeper understanding and knowledge of the attack. The study allows cyber risk assessment and management so as to enable and help organizations and Government be better prepared and more resilient against cyber threats and attacks.