Agaricus bisporus is a species of mushroom commonly known as the button mushroom. It is one of the most widely cultivated and consumed mushrooms in the world. This mushroom is typically small, with a smooth, white cap that can turn brown as it matures. It is rich in nutrients, including vitamins B and D, and is low in calories, making it a popular choice for various dishes. In addition to the button mushroom, Agaricus bisporus includes other varieties such as the cremini and portobello mushrooms. These mushrooms are versatile and can be used in salads, soups, and stir-fries. They are also known for their umami flavor, enhancing the taste of many recipes.