A coffee grinder is a kitchen appliance used to grind coffee beans into a fine powder or coarse granules, depending on the desired brewing method. There are two main types of coffee 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. Using a coffee grinder allows for fresher coffee, as whole beans retain their flavor longer than pre-ground coffee. The grind size can significantly affect the taste and strength of the brew, making it an essential tool for coffee enthusiasts and those who enjoy brewing their own coffee.