Let's get to know the air defense better; From basic concepts to Iran's systems At your request, dear friends, we have prepared this illustrated and interactive guide to familiarize you more with the concepts, equipment and functions of air defense. The content begins with basic definitions and the difference between active and passive sensors, and progresses to short, medium and long range categories, types of guns and missiles, and an introduction to Iran's air defense families. Along with the smooth, continuous text, we've included real pictures, Persian tables, and diagrams to clarify each topic and allow you to better distinguish the differences in names, components, and the role of each system when reading news and equipment introductions. The file is readable on phones and computers and can be opened without internet access after downloading.