A cold brew coffee maker is a specialized device 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. These makers often come in various designs, including immersion brewers and drip systems. Many models feature a built-in filter to separate the coffee grounds from the liquid easily. Cold brew coffee is popular for its refreshing taste and can be enjoyed over ice or as a base for various coffee drinks.