1. Home theater type: Its characteristic is that the brightness is around 2000 lumens (this number continues to increase with the development of projection, resulting in high contrast), the aspect ratio of the projected image is mostly 16:9, and various video ports are complete, suitable for playing movies and high-definition TVs, and suitable for household use. 2. Portable Business Projector: Projectors weighing less than 2 kilograms are generally defined as business portable projectors, which are comparable in weight to lightweight laptops. The advantages of business portable projectors include small size, light weight, and strong mobility. They are a substitute for traditional projectors and large and medium-sized projectors. The combination of lightweight laptops and business portable projectors is a suitable choice for mobile business users when conducting mobile business presentations. 3. Educational conference projector: generally positioned for school and enterprise applications, using mainstream resolution, brightness of around 2000-3000 lumens, moderate weight, good heat dissipation and dust prevention, suitable for installation and short distance movement, rich functional interfaces, easy maintenance, relatively high performance price ratio, suitable for large-scale procurement and popularization. Projector (3) 4. Mainstream engineering projectors: Compared to mainstream ordinary projectors, engineering projectors have a larger projection area, farther distance, high brightness, and generally support multiple bulb modes, which can better cope with large and changing installation environments. They are suitable for fields such as education, media, and government. 5. Professional theater type projector: This type of projector focuses more on stability, emphasizes low failure rates, and has strong performance in heat dissipation, network functionality, and ease of use. Of course, in order to adapt to various professional applications, the main feature of the projector is its high brightness, which can generally reach over 5000 lumens, and the highest can exceed 10000 lumens. Due to its large size and heavy weight, it is usually used for special purposes such as theaters, museums, conference halls, public areas, and can also be applied to monitoring traffic, public security command centers, fire and air traffic control centers, and other environments.