What is the purpose of a coffee grinder?

The purpose of a coffee grinder is to prepare coffee by grinding beans into the correct size, which is crucial for achieving optimal extraction during brewing. Different brewing methods require different grind sizes; for example, espresso requires a fine grind, while French press needs a coarse grind. If the coffee beans are not ground to the correct size, it can lead to over-extraction or under-extraction, resulting in a poor flavor profile in the final cup. Therefore, the efficiency of a grinder directly impacts the quality of the brewed coffee by ensuring the beans are cut into the size that best suits the brewing process being used. Proper grinding releases the essential oils and flavors locked within the coffee beans, enhancing the overall taste experience.