An extruder is a machine used to shape materials by forcing them through a specially designed opening called a die. It is commonly used in the manufacturing of plastic products, food items, and even metal components. The process involves heating the material until it becomes pliable, then pushing it through the die to create a continuous shape, such as tubes or sheets. Extruders can vary in size and complexity, from small tabletop models to large industrial machines. They are essential in industries like food processing, plastic manufacturing, and 3D printing, where precise shapes and consistent quality are crucial for production efficiency.