There are three main types of airbrushes: gravity feed, siphon feed, and side feed. Gravity feed airbrushes have a cup on top where the paint is fed through gravity. They are suitable for fine detail work and require less air pressure. Siphon feed airbrushes have a fluid container below the airbrush and are ideal for large coverage and faster application. Side feed airbrushes have a paint cup on the side, allowing for easy color changes. They are preferred for custom artwork and detailed projects.