Cold brew is a type of coffee that is brewed with cold or room temperature water for an extended period of time, typically 12 to 24 hours. The process involves steeping coarse coffee grounds in water for a prolonged period, which results in a smoother, less acidic coffee with a subtly sweet and nutty flavor. The lower acidity of cold brew coffee makes it a popular option for people with sensitive stomachs or those who want a less bitter coffee. It is known for its refreshing and bold flavor and is a favorite among coffee lovers who prefer a less acidic coffee experience.