This is the first volume of a four volume set of the Comprehensive Guide for Nanocoatings Technology. Nanocoatings are a kind of thin film with at least one nanometric dimension. The main difference between nano and ordinary coatings is in their structure and properties. To recognize these differences, it is required to study the properties and structure of nanocoatings. The properties of every substance are controlled by their constituents. In this regard, properties of coatings depend on the constituent grains and particles. The chemical, physical, and mechanical properties of nanocoatings including their electrical resistance, permeability, corrosion and abrasion resistance, and magnetic properties, which are a function of structure and particle size of coatings. It is evident that use of these features creates many potential applications. This volume mainly discusses the deposition and growth mechanism of nanocoatings. There are 16 chapters in this volume; each one includes examples of these interesting materials, supported by appropriate figures for better clarification.