This document provides an overview of artificial intelligence and its applications in cyber defense. It discusses topics like what AI is, the Turing test, fields of AI like expert systems, neural networks and intelligent agents. It provides examples of expert systems and their architecture. It also discusses applications of AI like credit granting, information retrieval and virus detection. Neural networks are described as artificial representations of the human brain that try to simulate its learning process. Different types of neural networks like biological and artificial are also mentioned.