A cold brew maker is a kitchen appliance designed to brew coffee using cold or room temperature water over an extended period, typically 12 to 24 hours. This method results in a smooth, less acidic coffee concentrate that can be diluted with water or milk before serving. Cold brew makers often come with a filter system to separate the coffee grounds from the liquid easily. These devices can vary in design, from simple pitchers with built-in filters to more complex systems with multiple components. Popular brands include Toddy, Hario, and Nespresso, each offering unique features to enhance the cold brewing experience.