Airlift bioreactors are specialized vessels used in biotechnology for cultivating microorganisms or cells. They utilize a unique design that promotes mixing and aeration without the need for mechanical stirring. This is achieved by creating a flow of liquid, which helps distribute nutrients and oxygen evenly throughout the culture. In an airlift bioreactor, gas bubbles are introduced at the bottom, causing the liquid to rise and circulate. This process enhances mass transfer and promotes cell growth, making it suitable for applications in pharmaceuticals, food production, and wastewater treatment. Their efficient design often leads to lower energy consumption compared to traditional stirred-tank reactors.