A paintbrush 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 materials like animal hair or synthetic fibers. Paintbrushes come in various shapes and sizes, allowing artists to create different effects and details in their work. Different types of paintbrushes serve specific purposes. For example, a flat brush is ideal for broad strokes, while a round brush is better for fine lines and details. Artists often choose their brushes based on the medium they are using, such as watercolor or acrylic paint.