Artificial intelligence (AI) refers to the intelligence that is demonstrated by machines. Devices that perceive the environment and act in a way that aids in the deliverance of its objectives and tasks, are called intelligent agents. Such agents execute tasks by mimicking the cognitive functions of the human brain such as learning and problem solving. Understanding human speech, intelligent routing in content delivery network, competing in strategic game systems such as chess and Go, etc. are all capabilities of artificial intelligence. The ultimate objective of AI is to achieve general intelligence. Artificial intelligence uses varied tools such as search algorithms, mathematical optimization, logic programming, Bayesian networks, etc. in order to solve the most complex problems related to computer science. This book presents the complex subject of artificial intelligence in the most comprehensible and easy to understand language. Most of the topics introduced in this book cover new techniques and the applications of AI. It is a complete source of knowledge on the present status of this important field.