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 them between two surfaces, providing a more consistent grind size. Using a coffee grinder can enhance the taste of your coffee, as freshly ground beans retain more flavor and aroma compared to pre-ground coffee. Many coffee enthusiasts prefer to grind their beans just before brewing to ensure the best possible taste in their cup of coffee.