A paint brush is a tool used for applying paint, ink, or other substances to a surface. It typically consists of a handle and bristles, which can be made from natural or synthetic materials. The bristles come in various shapes and sizes, allowing for different techniques and effects in painting. Paint brushes are commonly used in various forms of art, including watercolor painting, acrylic painting, and oil painting. They can also be found in crafting and home improvement projects. Proper care and cleaning of paint brushes are essential to maintain their quality and longevity.