Purpose: It's used to compress ground coffee into a dense, even puck within an espresso machine's portafilter, which is crucial for optimal water flow and extraction during brewing.
Material: Often made from food-grade stainless steel for durability and safety.
Types: Various sizes and styles exist, including classic tampers and palm tampers, with different designs for handle and base.
Importance: Proper tamping prevents channeling, promotes even extraction, and contributes to a rich, flavorful espresso with good crema.