A burr grinder is a type of coffee grinder that uses two revolving abrasive surfaces, or "burrs," to crush coffee beans into a consistent size. This method allows for a more uniform grind compared to blade grinders, which can produce uneven particle sizes. Burr grinders are preferred by coffee enthusiasts because they enhance the flavor extraction during brewing. There are two main types of burr grinders: flat burr grinders and conical burr grinders. Flat burr grinders have parallel burrs, while conical burr grinders have a cone-shaped burr that fits inside a ring burr. Both types can be adjusted to achieve different grind sizes, making them suitable for various brewing methods, such as espresso, French press, or pour-over.