Dust collectors can be classified into six major types based on their working principles: gravity separators, inertial separators, cyclone separators, bag dust collectors, electrostatic precipitators, and wet dust collectors. Each type has distinct characteristics that make it suitable for different industrial applications. To help readers accurately select the appropriate type, this chapter provides a comprehensive overview of each category. For every major type, the chapter introduces the basic structures, discusses advantages and disadvantages, and details the underlying separation theory and dust removal principles. Further, the chapter explains classification and performance distinctions, helping readers understand the operational range and efficiency of each dust collector. Finally, application examples are included for each type, illustrating real-world performance and practical use in various industries.