A pastry bag, also known as a piping bag, is a kitchen tool used for decorating and filling pastries, cakes, and other desserts. It is typically made of flexible material, such as plastic or cloth, and has a pointed end where various tips can be attached. These tips allow for different designs and textures when applying frosting, cream, or dough. Pastry bags come in various sizes to accommodate different tasks. They are commonly used in baking and pastry-making, making it easier to create intricate designs and precise shapes. Proper use of a pastry bag can enhance the presentation of desserts, making them visually appealing.