A coffee grinder is a kitchen appliance used to grind coffee beans into smaller particles, allowing for the extraction of flavor when brewing. There are two main types of grinders: blade grinders and burr grinders. Blade grinders use a rotating blade to chop the beans, while burr grinders crush the beans between two surfaces, providing a more consistent grind size. Using a coffee grinder can enhance the flavor of your coffee, as freshly ground beans retain more aroma and taste. The grind size can be adjusted depending on the brewing method, such as French press, espresso, or drip coffee, ensuring the best extraction for each style.