What is the part of a paintbrush that holds the bristles?

The part of a paintbrush that holds the bristles is known as the ferrule. The ferrule is typically made of metal or plastic and serves to securely attach the bristles to the handle of the brush. This component is crucial because it provides the necessary stability and structure needed for effective painting. The bristles themselves, which are responsible for applying the paint, are held firmly in place by the ferrule, ensuring that they maintain their shape and do not come loose during use.

The handle, while important for grip and control, is not responsible for holding the bristles. The tip refers to the very end of the bristles where paint is applied, but it does not serve the function of holding the bristles in place. Thus, the ferrule is specifically designed for this purpose, making it the correct answer.